https://artofproblemsolving.com/wiki/api.php?action=feedcontributions&user=Wlm2&feedformat=atomAoPS Wiki - User contributions [en]2024-03-28T11:52:35ZUser contributionsMediaWiki 1.31.1https://artofproblemsolving.com/wiki/index.php?title=2019_AMC_10B_Problems&diff=1022782019 AMC 10B Problems2019-02-14T17:45:21Z<p>Wlm2: /* Problem 4 */</p>
<hr />
<div>==Problem 1==<br />
<br />
Alicia had two containers. The first was <math>\tfrac{5}{6}</math> full of water and the second was empty. She poured all the water from the first container into the second container, at which point the second container was <math>\tfrac{3}{4}</math> full of water. What is the ratio of the volume of the first container to the volume of the second container?<br />
<br />
<math>\textbf{(A) } \frac{5}{8} \qquad \textbf{(B) } \frac{4}{5} \qquad \textbf{(C) } \frac{7}{8} \qquad \textbf{(D) } \frac{9}{10} \qquad \textbf{(E) } \frac{11}{12}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 1|Solution]]<br />
<br />
==Problem 2==<br />
<br />
Consider the statement, "If <math>n</math> is not prime, then <math>n-2</math> is prime." Which of the following values of <math>n</math> is a counterexample to this statement.<br />
<br />
<math>\textbf{(A) } 11 \qquad \textbf{(B) } 15 \qquad \textbf{(C) } 19 \qquad \textbf{(D) } 21 \qquad \textbf{(E) } 27</math><br />
<br />
[[2019 AMC 10B Problems/Problem 2|Solution]]<br />
<br />
==Problem 3==<br />
<br />
In a high school with <math>500</math> students, <math>40\%</math> of the seniors play a musical instrument, while <math>30\%</math> of the non-seniors do not play a musical instrument. In all, <math>46.8\%</math> of the students do not play a musical instrument. How many non-seniors play a musical instrument?<br />
<br />
<math>\textbf{(A) } 66 \qquad\textbf{(B) } 154 \qquad\textbf{(C) } 186 \qquad\textbf{(D) } 220 \qquad\textbf{(E) } 266</math><br />
<br />
[[2019 AMC 10B Problems/Problem 3|Solution]]<br />
<br />
==Problem 4==<br />
<br />
All lines with equation <math>ax+by=c</math> such that <math>a,b,c</math> form an arithmetic progression pass through a common point. What are the coordinates of that point?<br />
<br />
[[2019 AMC 10B Problems/Problem 4|Solution]]<br />
<br />
==Problem 5==<br />
<br />
[[2019 AMC 10B Problems/Problem 5|Solution]]<br />
<br />
==Problem 6==<br />
<br />
There is a real <math>n</math> such that <math>(n+1)! + (n+2)! = n! \cdot 440</math>. What is the sum of the digits of <math>n</math>?<br />
<br />
<math>\textbf{(A) }3\qquad\textbf{(B) }8\qquad\textbf{(C) }10\qquad\textbf{(D) }11\qquad\textbf{(E) }12</math><br />
<br />
[[2019 AMC 10B Problems/Problem 6|Solution]]<br />
<br />
==Problem 7==<br />
<br />
Each piece of candy in a store costs a whole number of cents. Casper has exactly enough money to buy either 12 pieces of red candy, 14 pieces of green candy, 15 pieces of blue candy, or <math>n</math> pieces of purple candy. A piece of purple candy costs 20 cents. What is the smallest possible value of <math>n</math>?<br />
<br />
<math>\textbf{(A) } 18 \qquad \textbf{(B) } 21 \qquad \textbf{(C) } 24\qquad \textbf{(D) } 25 \qquad \textbf{(E) } 28</math><br />
<br />
[[2019 AMC 10B Problems/Problem 7|Solution]]<br />
<br />
==Problem 8==<br />
<br />
[[2019 AMC 10B Problems/Problem 8|Solution]]<br />
<br />
==Problem 9==<br />
<br />
[[2019 AMC 10B Problems/Problem 9|Solution]]<br />
<br />
==Problem 10==<br />
<br />
In a given plane, points <math>A</math> and <math>B</math> are <math>10</math> units apart. How many points <math>C</math> are there in the plane such that the perimeter of <math>\triangle ABC</math> is <math>50</math> units and the area of <math>\triangle ABC</math> is <math>100</math> square units?<br />
<br />
<math>\textbf{(A) }0\qquad\textbf{(B) }2\qquad\textbf{(C) }4\qquad\textbf{(D) }8\qquad\textbf{(E) }\text{infinitely many}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 10|Solution]]<br />
<br />
==Problem 11==<br />
<br />
[[2019 AMC 10B Problems/Problem 11|Solution]]<br />
<br />
==Problem 12==<br />
<br />
[[2019 AMC 10B Problems/Problem 12|Solution]]<br />
<br />
==Problem 13==<br />
<br />
What is the sum of all real numbers <math>x</math> for which the median of the numbers <math>4,6,8,17,</math> and <math>x</math> is equal to the mean of those five numbers?<br />
<br />
<math>\textbf{(A) } -5 \qquad\textbf{(B) } 0 \qquad\textbf{(C) } 5 \qquad\textbf{(D) } \frac{15}{4} \qquad\textbf{(E) } \frac{35}{4}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 13|Solution]]<br />
<br />
==Problem 14==<br />
<br />
[[2019 AMC 10B Problems/Problem 14|Solution]]<br />
<br />
==Problem 15==<br />
<br />
[[2019 AMC 10B Problems/Problem 15|Solution]]<br />
<br />
==Problem 16==<br />
<br />
[[2019 AMC 10B Problems/Problem 16|Solution]]<br />
<br />
==Problem 17==<br />
<br />
[[2019 AMC 10B Problems/Problem 17|Solution]]<br />
<br />
==Problem 18==<br />
<br />
Henry decides one morning to do a workout, and he walks <math>\tfrac{3}{4}</math> of the way from his home to his gym. The gym is <math>2</math> kilometers away from Henry's home. At that point, he changes his mind and walks <math>\tfrac{3}{4}</math> of the way from where he is back toward home. When he reaches that point, he changes his mind again and walks <math>\tfrac{3}{4}</math> of the distance from there back toward the gym. If Henry keeps changing his mind when he has walked <math>\tfrac{3}{4}</math> of the distance toward either the gym or home from the point where he last changed his mind, he will get very close to walking back and forth between a point <math>A</math> kilometers from home and a point <math>B</math> kilometers from home. What is <math>|A-B|</math>?<br />
<br />
<math>\textbf{(A) } \frac{2}{3} \qquad \textbf{(B) } 1 \qquad \textbf{(C) } 1\frac{1}{5} \qquad \textbf{(D) } 1\frac{1}{4} \qquad \textbf{(E) } 1\frac{1}{2}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 18|Solution]]<br />
<br />
==Problem 19==<br />
<br />
Let <math>S</math> be the set of all positive integer divisors of <math>100,000.</math> How many numbers are the product of two distinct elements of <math>S?</math><br />
<br />
<math>\textbf{(A) }98\qquad\textbf{(B) }100\qquad\textbf{(C) }117\qquad\textbf{(D) }119\qquad\textbf{(E) }121</math><br />
<br />
[[2019 AMC 10B Problems/Problem 19|Solution]]<br />
<br />
==Problem 20==<br />
<br />
[[2019 AMC 10B Problems/Problem 20|Solution]]<br />
<br />
==Problem 21==<br />
<br />
Debra flips a fair coin repeatedly, keeping track of how many heads and how many tails she has seen in total, until she gets either two heads in a row or two tails in a row, at which point she stops flipping. What is the probability that she gets two heads in a row but she sees a second tail before she sees a second head?<br />
<br />
<math>\textbf{(A) } \frac{1}{36} \qquad \textbf{(B) } \frac{1}{24} \qquad \textbf{(C) } \frac{1}{18} \qquad \textbf{(D) } \frac{1}{12} \qquad \textbf{(E) } \frac{1}{6}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 21|Solution]]<br />
<br />
==Problem 22==<br />
<br />
[[2019 AMC 10B Problems/Problem 22|Solution]]<br />
<br />
==Problem 23==<br />
<br />
Points <math>A(6,13)</math> and <math>B(12,11)</math> lie on circle <math>\omega</math> in the plane. Suppose that the tangent lines to <math>\omega</math> at <math>A</math> and <math>B</math> intersect at a point on the <math>x</math>-axis. What is the area of <math>\omega</math>?<br />
<br />
<math>\textbf{(A) }\frac{83\pi}{8}\qquad\textbf{(B) }\frac{21\pi}{2}\qquad\textbf{(C) }<br />
\frac{85\pi}{8}\qquad\textbf{(D) }\frac{43\pi}{4}\qquad\textbf{(E) }\frac{87\pi}{8}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 23|Solution]]<br />
<br />
==Problem 24==<br />
<br />
Define a sequence recursively by <math>x_0=5</math> and<br />
<cmath>x_{n+1}=\frac{x_n^2+5x_n+4}{x_n+6}</cmath>for all nonnegative integers <math>n.</math> Let <math>m</math> be the least positive integer such that<br />
<cmath>x_m\leq 4+\frac{1}{2^{20}}.</cmath>In which of the following intervals does <math>m</math> lie?<br />
<br />
<math>\textbf{(A) } [9,26] \qquad\textbf{(B) } [27,80] \qquad\textbf{(C) } [81,242]\qquad\textbf{(D) } [243,728] \qquad\textbf{(E) } [729,\infty]</math><br />
<br />
[[2019 AMC 10B Problems/Problem 24|Solution]]<br />
<br />
==Problem 25==<br />
<br />
How many sequences of <math>0</math>s and <math>1</math>s of length <math>19</math> are there that begin with a <math>0</math>, end with a <math>0</math>, contain no two consecutive <math>0</math>s, and contain no three consecutive <math>1</math>s?<br />
<br />
<math>\textbf{(A) }55\qquad\textbf{(B) }60\qquad\textbf{(C) }65\qquad\textbf{(D) }70\qquad\textbf{(E) }75</math><br />
<br />
[[2019 AMC 10B Problems/Problem 25|Solution]]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=2019_AMC_10B_Problems&diff=1022772019 AMC 10B Problems2019-02-14T17:45:05Z<p>Wlm2: /* Problem 4 */</p>
<hr />
<div>==Problem 1==<br />
<br />
Alicia had two containers. The first was <math>\tfrac{5}{6}</math> full of water and the second was empty. She poured all the water from the first container into the second container, at which point the second container was <math>\tfrac{3}{4}</math> full of water. What is the ratio of the volume of the first container to the volume of the second container?<br />
<br />
<math>\textbf{(A) } \frac{5}{8} \qquad \textbf{(B) } \frac{4}{5} \qquad \textbf{(C) } \frac{7}{8} \qquad \textbf{(D) } \frac{9}{10} \qquad \textbf{(E) } \frac{11}{12}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 1|Solution]]<br />
<br />
==Problem 2==<br />
<br />
Consider the statement, "If <math>n</math> is not prime, then <math>n-2</math> is prime." Which of the following values of <math>n</math> is a counterexample to this statement.<br />
<br />
<math>\textbf{(A) } 11 \qquad \textbf{(B) } 15 \qquad \textbf{(C) } 19 \qquad \textbf{(D) } 21 \qquad \textbf{(E) } 27</math><br />
<br />
[[2019 AMC 10B Problems/Problem 2|Solution]]<br />
<br />
==Problem 3==<br />
<br />
In a high school with <math>500</math> students, <math>40\%</math> of the seniors play a musical instrument, while <math>30\%</math> of the non-seniors do not play a musical instrument. In all, <math>46.8\%</math> of the students do not play a musical instrument. How many non-seniors play a musical instrument?<br />
<br />
<math>\textbf{(A) } 66 \qquad\textbf{(B) } 154 \qquad\textbf{(C) } 186 \qquad\textbf{(D) } 220 \qquad\textbf{(E) } 266</math><br />
<br />
[[2019 AMC 10B Problems/Problem 3|Solution]]<br />
<br />
==Problem 4==<br />
<br />
All lines with equation <math>ax+by=c</math> such that <math>a,b,c</math> form an arithmetic progression pass through a common point. What are teh coordinates of that point?<br />
<br />
[[2019 AMC 10B Problems/Problem 4|Solution]]<br />
<br />
==Problem 5==<br />
<br />
[[2019 AMC 10B Problems/Problem 5|Solution]]<br />
<br />
==Problem 6==<br />
<br />
There is a real <math>n</math> such that <math>(n+1)! + (n+2)! = n! \cdot 440</math>. What is the sum of the digits of <math>n</math>?<br />
<br />
<math>\textbf{(A) }3\qquad\textbf{(B) }8\qquad\textbf{(C) }10\qquad\textbf{(D) }11\qquad\textbf{(E) }12</math><br />
<br />
[[2019 AMC 10B Problems/Problem 6|Solution]]<br />
<br />
==Problem 7==<br />
<br />
Each piece of candy in a store costs a whole number of cents. Casper has exactly enough money to buy either 12 pieces of red candy, 14 pieces of green candy, 15 pieces of blue candy, or <math>n</math> pieces of purple candy. A piece of purple candy costs 20 cents. What is the smallest possible value of <math>n</math>?<br />
<br />
<math>\textbf{(A) } 18 \qquad \textbf{(B) } 21 \qquad \textbf{(C) } 24\qquad \textbf{(D) } 25 \qquad \textbf{(E) } 28</math><br />
<br />
[[2019 AMC 10B Problems/Problem 7|Solution]]<br />
<br />
==Problem 8==<br />
<br />
[[2019 AMC 10B Problems/Problem 8|Solution]]<br />
<br />
==Problem 9==<br />
<br />
[[2019 AMC 10B Problems/Problem 9|Solution]]<br />
<br />
==Problem 10==<br />
<br />
In a given plane, points <math>A</math> and <math>B</math> are <math>10</math> units apart. How many points <math>C</math> are there in the plane such that the perimeter of <math>\triangle ABC</math> is <math>50</math> units and the area of <math>\triangle ABC</math> is <math>100</math> square units?<br />
<br />
<math>\textbf{(A) }0\qquad\textbf{(B) }2\qquad\textbf{(C) }4\qquad\textbf{(D) }8\qquad\textbf{(E) }\text{infinitely many}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 10|Solution]]<br />
<br />
==Problem 11==<br />
<br />
[[2019 AMC 10B Problems/Problem 11|Solution]]<br />
<br />
==Problem 12==<br />
<br />
[[2019 AMC 10B Problems/Problem 12|Solution]]<br />
<br />
==Problem 13==<br />
<br />
What is the sum of all real numbers <math>x</math> for which the median of the numbers <math>4,6,8,17,</math> and <math>x</math> is equal to the mean of those five numbers?<br />
<br />
<math>\textbf{(A) } -5 \qquad\textbf{(B) } 0 \qquad\textbf{(C) } 5 \qquad\textbf{(D) } \frac{15}{4} \qquad\textbf{(E) } \frac{35}{4}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 13|Solution]]<br />
<br />
==Problem 14==<br />
<br />
[[2019 AMC 10B Problems/Problem 14|Solution]]<br />
<br />
==Problem 15==<br />
<br />
[[2019 AMC 10B Problems/Problem 15|Solution]]<br />
<br />
==Problem 16==<br />
<br />
[[2019 AMC 10B Problems/Problem 16|Solution]]<br />
<br />
==Problem 17==<br />
<br />
[[2019 AMC 10B Problems/Problem 17|Solution]]<br />
<br />
==Problem 18==<br />
<br />
Henry decides one morning to do a workout, and he walks <math>\tfrac{3}{4}</math> of the way from his home to his gym. The gym is <math>2</math> kilometers away from Henry's home. At that point, he changes his mind and walks <math>\tfrac{3}{4}</math> of the way from where he is back toward home. When he reaches that point, he changes his mind again and walks <math>\tfrac{3}{4}</math> of the distance from there back toward the gym. If Henry keeps changing his mind when he has walked <math>\tfrac{3}{4}</math> of the distance toward either the gym or home from the point where he last changed his mind, he will get very close to walking back and forth between a point <math>A</math> kilometers from home and a point <math>B</math> kilometers from home. What is <math>|A-B|</math>?<br />
<br />
<math>\textbf{(A) } \frac{2}{3} \qquad \textbf{(B) } 1 \qquad \textbf{(C) } 1\frac{1}{5} \qquad \textbf{(D) } 1\frac{1}{4} \qquad \textbf{(E) } 1\frac{1}{2}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 18|Solution]]<br />
<br />
==Problem 19==<br />
<br />
Let <math>S</math> be the set of all positive integer divisors of <math>100,000.</math> How many numbers are the product of two distinct elements of <math>S?</math><br />
<br />
<math>\textbf{(A) }98\qquad\textbf{(B) }100\qquad\textbf{(C) }117\qquad\textbf{(D) }119\qquad\textbf{(E) }121</math><br />
<br />
[[2019 AMC 10B Problems/Problem 19|Solution]]<br />
<br />
==Problem 20==<br />
<br />
[[2019 AMC 10B Problems/Problem 20|Solution]]<br />
<br />
==Problem 21==<br />
<br />
Debra flips a fair coin repeatedly, keeping track of how many heads and how many tails she has seen in total, until she gets either two heads in a row or two tails in a row, at which point she stops flipping. What is the probability that she gets two heads in a row but she sees a second tail before she sees a second head?<br />
<br />
<math>\textbf{(A) } \frac{1}{36} \qquad \textbf{(B) } \frac{1}{24} \qquad \textbf{(C) } \frac{1}{18} \qquad \textbf{(D) } \frac{1}{12} \qquad \textbf{(E) } \frac{1}{6}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 21|Solution]]<br />
<br />
==Problem 22==<br />
<br />
[[2019 AMC 10B Problems/Problem 22|Solution]]<br />
<br />
==Problem 23==<br />
<br />
Points <math>A(6,13)</math> and <math>B(12,11)</math> lie on circle <math>\omega</math> in the plane. Suppose that the tangent lines to <math>\omega</math> at <math>A</math> and <math>B</math> intersect at a point on the <math>x</math>-axis. What is the area of <math>\omega</math>?<br />
<br />
<math>\textbf{(A) }\frac{83\pi}{8}\qquad\textbf{(B) }\frac{21\pi}{2}\qquad\textbf{(C) }<br />
\frac{85\pi}{8}\qquad\textbf{(D) }\frac{43\pi}{4}\qquad\textbf{(E) }\frac{87\pi}{8}</math><br />
<br />
[[2019 AMC 10B Problems/Problem 23|Solution]]<br />
<br />
==Problem 24==<br />
<br />
Define a sequence recursively by <math>x_0=5</math> and<br />
<cmath>x_{n+1}=\frac{x_n^2+5x_n+4}{x_n+6}</cmath>for all nonnegative integers <math>n.</math> Let <math>m</math> be the least positive integer such that<br />
<cmath>x_m\leq 4+\frac{1}{2^{20}}.</cmath>In which of the following intervals does <math>m</math> lie?<br />
<br />
<math>\textbf{(A) } [9,26] \qquad\textbf{(B) } [27,80] \qquad\textbf{(C) } [81,242]\qquad\textbf{(D) } [243,728] \qquad\textbf{(E) } [729,\infty]</math><br />
<br />
[[2019 AMC 10B Problems/Problem 24|Solution]]<br />
<br />
==Problem 25==<br />
<br />
How many sequences of <math>0</math>s and <math>1</math>s of length <math>19</math> are there that begin with a <math>0</math>, end with a <math>0</math>, contain no two consecutive <math>0</math>s, and contain no three consecutive <math>1</math>s?<br />
<br />
<math>\textbf{(A) }55\qquad\textbf{(B) }60\qquad\textbf{(C) }65\qquad\textbf{(D) }70\qquad\textbf{(E) }75</math><br />
<br />
[[2019 AMC 10B Problems/Problem 25|Solution]]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=2016_AMC_10A_Problems/Problem_18&diff=862862016 AMC 10A Problems/Problem 182017-07-06T18:49:14Z<p>Wlm2: /* Solution 1 */</p>
<hr />
<div>==Problem==<br />
<br />
Each vertex of a cube is to be labeled with an integer <math>1</math> through <math>8</math>, with each integer being used once, in such a way that the sum of the four numbers on the vertices of a face is the same for each face. Arrangements that can be obtained from each other through rotations of the cube are considered to be the same. How many different arrangements are possible?<br />
<br />
<math>\textbf{(A) } 1\qquad\textbf{(B) } 3\qquad\textbf{(C) }6 \qquad\textbf{(D) }12 \qquad\textbf{(E) }24</math><br />
<br />
==Solution 1==<br />
<br />
First of all, the adjacent faces have the same sum <math>(18</math>, because <math>1+2+3+4+5+6+7+8=36</math>, <math>36/2=18)</math>, <br />
so now consider the <math>opposite \text{ } sides</math> (the two sides which are parallel but not in same face of the cube);<br />
they must have the same sum value too.<br />
Now think about the extreme condition 1 and 8 , if they are not sharing the same side, which means they would become end points of <math>opposite \text{ } sides</math>,<br />
we should have <math>1+X=8+Y</math>, but no solution for <math>[2,7]</math>, contradiction. <br />
<br />
Now we know <math>1</math> and <math>8</math> must share the same side, which sum is <math>9</math>, the <math>opposite \text{ } side</math> also must have sum of <math>9</math>, same thing for the other two parallel sides.<br />
<br />
Now we have <math>4</math> parallel sides <math>1-8, 2-7, 3-6, 4-5</math>.<br />
thinking about <math>4</math> end points number need to have sum of <math>18</math>.<br />
It is easy to notice only <math>1-7-6-4</math> vs <math>8-2-3-5</math> would work.<br />
<br />
So if we fix one direction <math>1-8 (</math>or <math>8-1)</math> all other <math>3</math> parallel sides must lay in one particular direction. <math>(1-8,7-2,6-3,4-5)</math> or <math>(8-1,2-7,3-6,5-4)</math><br />
<br />
Now, the problem is same as the problem to arrange <math>4</math> points in a <math>2-D</math> square. which is <math>4!/4</math>=<math>\boxed{\textbf{(C) }6.}</math><br />
<br />
== Solution 2 ==<br />
<br />
Again, all faces sum to <math>18.</math> If <math>x,y,z</math> are the vertices next to one, then the remaining vertices are <math>17-x-y, 17-y-z, 17-x-z, x+y+z-16.</math> Now it remains to test possibilities. Note that we must have <math>x+y+z>17.</math> Without loss of generality, let <math>x<y<z.</math><br />
<br />
<math>3,7,8:</math> Does not work.<br />
<math>4,6,8:</math> Works.<br />
<math>5,6,7:</math> Does not work.<br />
<math>5,6,8:</math> Works.<br />
<math>5,7,8:</math> Does not work.<br />
<math>6,7,8:</math> Works.<br />
<br />
So our answer is <math>3\cdot 2=\boxed{\textbf{(C) }6.}</math><br />
<br />
== Solution 3 ==<br />
<br />
We know the sum of each face is <math>18.</math> If we look at an edge of the cube whose numbers sum to <math>x</math>, it must be possible to achieve the sum <math>18-x</math> in two distinct ways, looking at the two faces which contain the edge. If <math>8</math> and <math>6</math> were on the same face, it is possible to achieve the desired sum only with the numbers <math>1</math> and <math>3</math> since the values must be distinct. Similarly, if <math>8</math> and <math>7</math> were on the same face, the only way to get the sum is with <math>1</math> and <math>2</math>. This means that <math>6</math> and <math>7</math> are not on the same edge as <math>8</math>, or in other words they are diagonally across from it on the same face, or on the other end of the cube.<br />
<br />
Now we look at three cases, each yielding two solutions which are reflections of each other:<br />
<br />
1) <math>6</math> and <math>7</math> are diagonally opposite <math>8</math> on the same face.<br />
2) <math>6</math> is diagonally across the cube from <math>8</math>, while <math>7</math> is diagonally across from <math>8</math> on the same face.<br />
3) <math>7</math> is diagonally across the cube from <math>8</math>, while <math>6</math> is diagonally across from <math>8</math> on the same face.<br />
<br />
This means the answer is <math>3\cdot 2=\boxed{\textbf{(C) }6.}</math><br />
<br />
==See Also==<br />
{{AMC10 box|year=2016|ab=A|num-b=17|num-a=19}}<br />
{{AMC12 box|year=2016|ab=A|num-b=13|num-a=15}}<br />
{{MAA Notice}}</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=2016_AMC_10A_Problems/Problem_18&diff=862852016 AMC 10A Problems/Problem 182017-07-06T18:47:37Z<p>Wlm2: /* Solution 1 */</p>
<hr />
<div>==Problem==<br />
<br />
Each vertex of a cube is to be labeled with an integer <math>1</math> through <math>8</math>, with each integer being used once, in such a way that the sum of the four numbers on the vertices of a face is the same for each face. Arrangements that can be obtained from each other through rotations of the cube are considered to be the same. How many different arrangements are possible?<br />
<br />
<math>\textbf{(A) } 1\qquad\textbf{(B) } 3\qquad\textbf{(C) }6 \qquad\textbf{(D) }12 \qquad\textbf{(E) }24</math><br />
<br />
==Solution 1==<br />
<br />
First of all, the adjacent faces have the same sum <math>(18</math>, because <math>1+2+3+4+5+6+7+8=36</math>, <math>36/2=18)</math>, <br />
so now consider the <math>opposite \text{ } sides</math> (the two sides which are parallel but not in same face of the cube);<br />
they must have same the same sum value too.<br />
Now think about the extreme condition 1 and 8 , if they are not sharing the same side, which means they would become end points of <math>opposite \text{ } sides</math>,<br />
we should have <math>1+X=8+Y</math>, but no solution for <math>[2,7]</math>, contradiction. <br />
<br />
Now we know <math>1</math> and <math>8</math> must share the same side, which sum is <math>9</math>, the <math>opposite \text{ } side</math> also must have sum of <math>9</math>, same thing for the other two parallel sides.<br />
<br />
Now we have <math>4</math> parallel sides <math>1-8, 2-7, 3-6, 4-5</math>.<br />
thinking about <math>4</math> end points number need to have sum of <math>18</math>.<br />
It is easy to notice only <math>1-7-6-4</math> vs <math>8-2-3-5</math> would work.<br />
<br />
So if we fix one direction <math>1-8 (</math>or <math>8-1)</math> all other <math>3</math> parallel sides must lay in one particular direction. <math>(1-8,7-2,6-3,4-5)</math> or <math>(8-1,2-7,3-6,5-4)</math><br />
<br />
Now, the problem is same as the problem to arrange <math>4</math> points in a <math>2-D</math> square. which is <math>4!/4</math>=<math>\boxed{\textbf{(C) }6.}</math><br />
<br />
== Solution 2 ==<br />
<br />
Again, all faces sum to <math>18.</math> If <math>x,y,z</math> are the vertices next to one, then the remaining vertices are <math>17-x-y, 17-y-z, 17-x-z, x+y+z-16.</math> Now it remains to test possibilities. Note that we must have <math>x+y+z>17.</math> Without loss of generality, let <math>x<y<z.</math><br />
<br />
<math>3,7,8:</math> Does not work.<br />
<math>4,6,8:</math> Works.<br />
<math>5,6,7:</math> Does not work.<br />
<math>5,6,8:</math> Works.<br />
<math>5,7,8:</math> Does not work.<br />
<math>6,7,8:</math> Works.<br />
<br />
So our answer is <math>3\cdot 2=\boxed{\textbf{(C) }6.}</math><br />
<br />
== Solution 3 ==<br />
<br />
We know the sum of each face is <math>18.</math> If we look at an edge of the cube whose numbers sum to <math>x</math>, it must be possible to achieve the sum <math>18-x</math> in two distinct ways, looking at the two faces which contain the edge. If <math>8</math> and <math>6</math> were on the same face, it is possible to achieve the desired sum only with the numbers <math>1</math> and <math>3</math> since the values must be distinct. Similarly, if <math>8</math> and <math>7</math> were on the same face, the only way to get the sum is with <math>1</math> and <math>2</math>. This means that <math>6</math> and <math>7</math> are not on the same edge as <math>8</math>, or in other words they are diagonally across from it on the same face, or on the other end of the cube.<br />
<br />
Now we look at three cases, each yielding two solutions which are reflections of each other:<br />
<br />
1) <math>6</math> and <math>7</math> are diagonally opposite <math>8</math> on the same face.<br />
2) <math>6</math> is diagonally across the cube from <math>8</math>, while <math>7</math> is diagonally across from <math>8</math> on the same face.<br />
3) <math>7</math> is diagonally across the cube from <math>8</math>, while <math>6</math> is diagonally across from <math>8</math> on the same face.<br />
<br />
This means the answer is <math>3\cdot 2=\boxed{\textbf{(C) }6.}</math><br />
<br />
==See Also==<br />
{{AMC10 box|year=2016|ab=A|num-b=17|num-a=19}}<br />
{{AMC12 box|year=2016|ab=A|num-b=13|num-a=15}}<br />
{{MAA Notice}}</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=2016_AMC_10A_Problems/Problem_18&diff=862842016 AMC 10A Problems/Problem 182017-07-06T18:47:14Z<p>Wlm2: /* Solution 1 */</p>
<hr />
<div>==Problem==<br />
<br />
Each vertex of a cube is to be labeled with an integer <math>1</math> through <math>8</math>, with each integer being used once, in such a way that the sum of the four numbers on the vertices of a face is the same for each face. Arrangements that can be obtained from each other through rotations of the cube are considered to be the same. How many different arrangements are possible?<br />
<br />
<math>\textbf{(A) } 1\qquad\textbf{(B) } 3\qquad\textbf{(C) }6 \qquad\textbf{(D) }12 \qquad\textbf{(E) }24</math><br />
<br />
==Solution 1==<br />
<br />
First of all, the adjacent faces have same sum <math>(18</math>, because <math>1+2+3+4+5+6+7+8=36</math>, <math>36/2=18)</math>, <br />
consider the <math>opposite \text{ } sides</math> (the two sides which are parallel but not in same face of the cube);<br />
they must have same the same sum value too.<br />
Now think about the extreme condition 1 and 8 , if they are not sharing the same side, which means they would become end points of <math>opposite \text{ } sides</math>,<br />
we should have <math>1+X=8+Y</math>, but no solution for <math>[2,7]</math>, contradiction. <br />
<br />
Now we know <math>1</math> and <math>8</math> must share the same side, which sum is <math>9</math>, the <math>opposite \text{ } side</math> also must have sum of <math>9</math>, same thing for the other two parallel sides.<br />
<br />
Now we have <math>4</math> parallel sides <math>1-8, 2-7, 3-6, 4-5</math>.<br />
thinking about <math>4</math> end points number need to have sum of <math>18</math>.<br />
It is easy to notice only <math>1-7-6-4</math> vs <math>8-2-3-5</math> would work.<br />
<br />
So if we fix one direction <math>1-8 (</math>or <math>8-1)</math> all other <math>3</math> parallel sides must lay in one particular direction. <math>(1-8,7-2,6-3,4-5)</math> or <math>(8-1,2-7,3-6,5-4)</math><br />
<br />
Now, the problem is same as the problem to arrange <math>4</math> points in a <math>2-D</math> square. which is <math>4!/4</math>=<math>\boxed{\textbf{(C) }6.}</math><br />
<br />
== Solution 2 ==<br />
<br />
Again, all faces sum to <math>18.</math> If <math>x,y,z</math> are the vertices next to one, then the remaining vertices are <math>17-x-y, 17-y-z, 17-x-z, x+y+z-16.</math> Now it remains to test possibilities. Note that we must have <math>x+y+z>17.</math> Without loss of generality, let <math>x<y<z.</math><br />
<br />
<math>3,7,8:</math> Does not work.<br />
<math>4,6,8:</math> Works.<br />
<math>5,6,7:</math> Does not work.<br />
<math>5,6,8:</math> Works.<br />
<math>5,7,8:</math> Does not work.<br />
<math>6,7,8:</math> Works.<br />
<br />
So our answer is <math>3\cdot 2=\boxed{\textbf{(C) }6.}</math><br />
<br />
== Solution 3 ==<br />
<br />
We know the sum of each face is <math>18.</math> If we look at an edge of the cube whose numbers sum to <math>x</math>, it must be possible to achieve the sum <math>18-x</math> in two distinct ways, looking at the two faces which contain the edge. If <math>8</math> and <math>6</math> were on the same face, it is possible to achieve the desired sum only with the numbers <math>1</math> and <math>3</math> since the values must be distinct. Similarly, if <math>8</math> and <math>7</math> were on the same face, the only way to get the sum is with <math>1</math> and <math>2</math>. This means that <math>6</math> and <math>7</math> are not on the same edge as <math>8</math>, or in other words they are diagonally across from it on the same face, or on the other end of the cube.<br />
<br />
Now we look at three cases, each yielding two solutions which are reflections of each other:<br />
<br />
1) <math>6</math> and <math>7</math> are diagonally opposite <math>8</math> on the same face.<br />
2) <math>6</math> is diagonally across the cube from <math>8</math>, while <math>7</math> is diagonally across from <math>8</math> on the same face.<br />
3) <math>7</math> is diagonally across the cube from <math>8</math>, while <math>6</math> is diagonally across from <math>8</math> on the same face.<br />
<br />
This means the answer is <math>3\cdot 2=\boxed{\textbf{(C) }6.}</math><br />
<br />
==See Also==<br />
{{AMC10 box|year=2016|ab=A|num-b=17|num-a=19}}<br />
{{AMC12 box|year=2016|ab=A|num-b=13|num-a=15}}<br />
{{MAA Notice}}</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Wiki:FAQ&diff=86270AoPS Wiki:FAQ2017-07-05T21:35:07Z<p>Wlm2: /* AoPS Acronyms */</p>
<hr />
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*'''tytia'''- Thank you, that is all<br />
*'''xD'''- Bursting Laugh<br />
<br />
== FTW! ==<br />
<br />
Please see the [//artofproblemsolving.com/ftw/faq For the Win! FAQ] for many common questions.<br />
<br />
== School ==<br />
<br />
==== What if I miss a class? ====<br />
:There are classroom transcripts available under My Classes, available at the top right of the web site. You can view these transcripts in order to review any missed material. You can also ask questions on the class message board. Don't worry, though, classroom participation usually isn't weighted heavily.<br />
<br />
==== Is there audio or video in class? ====<br />
:There is generally no audio or video in the class. The classes are generally text and image based, in an interactive chat room environment, which allows students to ask questions at any time during the class. In addition to audio and video limiting interactivity and being less pedagogically effective, the technology isn't quite there yet for all students to be able to adequately receive streaming audio and video.<br />
<br />
==== What if I want to drop out of a class? ====<br />
:For any course with more than 2 classes, students can drop the course any time before the third class begins and receive a full refund. No drops are allowed after the third class has started. To drop the class, go to the My Classes section by clicking the My Classes link at the top-right of the website. Then find the area on the right side of the page that lets you drop the class. A refund will be processed within 10 business days.<br />
<br />
==== For my homework, there is suppose to be a green bar but it's orange, why? ====<br />
<br />
:For the bar to turn green, the writing problem must be attempted. Once it is attempted the bar will turn green.<br />
<br />
==== I need more time for my homework, what should I do? ====<br />
<br />
:There is a "Request Extension" button in the homework tab of your class. This will automatically extend the due date to 2 days after the normal deadline. If you want more time you need to ask for it in the little comment box, stating the reason why you want the extension, and how much time you want. This request will be looked at by the teachers and they will decide if you get the extension or not. Note that you can only use this button 3 times.<br />
:Otherwise, you can send an email to extensions@aops.com with your username, class name and ID, if known, and reason for extension. Someone should get back to you within a couple days.</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Wiki:FAQ&diff=86269AoPS Wiki:FAQ2017-07-05T21:29:34Z<p>Wlm2: /* Can I make more than one account? */</p>
<hr />
<div>{{shortcut|[[A:FAQ]]}}<br />
<br />
This is a community created list of Frequently Asked Questions about Art of Problem Solving. If you have a request to edit or add a question on this page, please make it [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=416&t=414129 here].<br />
<br />
== General==<br />
<br />
<br />
==== Can I change my user name? ====<br />
<br />
:As indicated during the time of your registration, you are unable to change your username. However, if you have a strong reason for doing so or if your username contains your real name, you can PM an admin and they will check your account to determine if your username can be changed. Should your username change request be approved, any edits to the AoPSWiki, Reaper results, or any cached content on Google or other search engines will not be changed.<br />
<br />
==== Something looks weird (e.g., blurry, missing line, etc.) ====<br />
<br />
: This is likely due to your browser zoom level. Please make sure your zoom level is at 100% for correct rendering of the web page.<br />
<br />
==== Can I make more than one account?==== <br />
<br />
:Short answer: No.<br />
<br />
:Long answer: Multiple accounts (multis) are banned on AoPS. Having more than one account leads to issues of not remembering on what account you did what. Using multiple accounts to "game" the system, (e.g. increase rating for posts or in online games) will lead to bans on all accounts associated to you. If you have already made additional accounts, please choose one account and stop using the others.<br />
<br />
====What software does Art of Problem Solving use to run the website?====<br />
<br />
:* Search: Solr<br />
:* Wiki: MediaWiki<br />
:* Asymptote and Latex are generated through their respective binary packages<br />
:* Videos: YouTube<br />
<br />
:All other parts of the website are custom built.<br />
<br />
====Can you make an AoPS App?====<br />
<br />
:There are currently no plans to build an app. Any app built would work almost identically to the website, and not be any faster, so there is little value in building an app.<br />
<br />
== Forums ==<br />
<br />
====How do I create a forum?====<br />
<br />
:To create an AoPS forum, an user must be on the AoPS community for at least 2 weeks. To create a forum, hover over the community tab, then click "My AoPS." You should now see your avatar, and a list of your friends. Now, click on the "My Forums" tab. There, you would be able to see which forum you moderate or administrate, as well as the private forums you can access. Click on the "+" button at the top right. This should lead you to a forum creating page.<br />
<br />
==== How do I format my post, e.g. bold text, add URLs, etc.? ====<br />
<br />
:AoPS is based on a markup language called BBCode. A tutorial of its functions on AoPS and how to use them can be found [[BBCode:Tutorial|here]].<br />
<br />
==== How do I hide content in the forums? ====<br />
:Wrap the content you want to hide in [hide] tags.<br />
[hide]Content[/hide]<br />
:If you want to customize the label, instead of saying "Click here to reveal hidden text", you can do something like:<br />
[hide=Label to display]Content[/hide]<br />
<br />
==== I got the message "You can not post at this time" when trying to post, why? ====<br />
<br />
:New users are not allowed to post messages with URLs and various other things. Once you have five posts you can post normally.<br />
<br />
====I got the message "Too many messages." when trying to send a private message, why?====<br />
:To prevent PM spam abuse, users with less than five forum posts are limited to four private messages within a forty-eight hour period.<br />
<br />
==== If I make more posts, it means I'm a better user, right? ====<br />
<br />
:Absolutely not. Post quality is far more important than post quantity. Users making a lot of senseless posts are often considered worse users, or spammers.<br />
<br />
==== I have made some posts but my post count did not increase. Why? ====<br />
<br />
:When you post in some of the forums, such as the Test Forum, Mafia Forum, Fun Factory, and most user created forums, the post does not count towards your overall post count.<br />
<br />
==== The time the post was posted seems wrong ====<br />
<br />
:Posts may say something weird for when posted, "such as 5 minutes ago" or some time in the future when you just posted. This is due to your system clock being incorrect. Please update your system clock to the correct time. Many operating systems have an option to keep the clock accurate automatically. Mac users may wish to check [http://www.macinstruct.com/node/92 Synchronize your Mac's Clock With A Time Server]. You can also check [http://www.time.gov the US offical time.]<br />
<br />
==== How does AoPS select moderators? ====<br />
<br />
:When a new moderator is needed in the forums, AoPS administrators first check if any current moderators could serve as a moderator of the forum which needs a moderator. Should none be found, AoPS administrators and/or other moderators scour the forum looking for productive users. They may also ask for suggestions from other moderators or trusted users on the site. Once they have pinpointed a possible candidate based on their long term usage of the site, productive posts in the forum, and having no recent behavioral issues, that user is asked if he or she would like to moderate the forum. <br />
<br />
:Less active forums often have no moderator. Inappropriate posts should be reported by users and administrators will take appropriate action.<br />
<br />
:AoPS receives MANY requests to be a moderator. As they receive so many, it is possible that you won't get a response should you request to be one. Also, AoPS very rarely makes someone a mod for asking to be one, so '''please do not ask'''.<br />
<br />
==== I believe a post needs corrective action. What should I do? ====<br />
<br />
:If you believe a post needs moderative action, you may report it by clicking the "!" icon on the upper-right corner of that post. If it's a minor mistake, you may want to PM the offending user instead and explain how they can make their post better. Usually, you shouldn't publicly post such things on a thread itself, which is called "backseat moderation" and is considered rude and unproductive.<br />
<br />
==== How long of a non-commented thread is considered reviving? ====<br />
<br />
:If any post is still on-topic and isn't spammy, it isn't considered reviving. However, everyone has a different period of time that they consider reviving. In general, apply common sense.<br />
<br />
==== How do I post images? ====<br />
<br />
:While AoPS forums have the ability to attach images, we do not generally recommend doing so, as we can not guarantee the images will be available through upgrades, restorations, etc. We also have limited disk space which causes us to remove attachments from time to time. Therefore, we recommend using a third party image hosting solution. There are many options, but we recommend imgur.com.<br />
<br />
:* Go to imgur.com<br />
:* Click upload images<br />
:* Follow the on screen instructions to upload the image to imgur.<br />
:* After uploading, you'll be presented the uploaded image along with links on the left.<br />
:* Find the link labeled BBCode (message boards & forums)<br />
:* Copy the code, and paste into your post. It will look something like:<br />
<br />
[img]http://i.imgur.com/aBcDeFgH.jpg[/img]<br />
<br />
== Blogs ==<br />
==== How come I can't create a blog? ====<br />
:One needs to have at least 5 posts in order to make a blog.<br />
==== How do I make my blog look nice? ====<br />
:Many AoPSers make their blogs look awesome by applying [[CSS|CSS]], which is a high-level stylesheet language. This can be done by typing CSS code into the CSS box in the Blog Control Panel.<br />
<br />
<br />
== Alcumus ==<br />
<br />
==== How is rating computed? ====<br />
:The rating is more of a prediction of what percentage of problems in the topic the Alcumus engine believes you will get correct. As you get more and more correct, the rating will go up slower and slower. However, if you are predicted to get most correct, and you miss one or two problems, the rating, or prediction of percentage correct, will go down.<br />
<br />
==== I am stuck on a problem, changing the topic does not change the problem. ====<br />
:Alcumus provides review problems to make sure you still recall information learned from the past. You are not able to skip these problems. You will need to answer the problem before moving on.<br />
<br />
==== Why can't I change topics? ====<br />
:Alcumus provides review problems to make sure you still recall information learned from the past. You are not able to skip these problems. You will need to answer the problem before the topic changes to the currently selected topic.<br />
<br />
==== Some Alcumus problems do not give points when I get them correct. Why is that? ====<br />
<br />
== Contests ==<br />
==== Where can I find past contest questions and solutions? ====<br />
:In the [http://www.artofproblemsolving.com/Forum/resources.php Contests] section.<br />
<br />
==== How do I get problems onto the contest page? ====<br />
<br />
:Make a topic for each question in the appropriate forum, copy/paste the urls to the National Olympiad. Your problems may eventually be submitted into the Contest page.<br />
<br />
==== What are the guidelines for posting problems to be added to the contests section? ====<br />
:Refer to the [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=144&t=195579 guidelines in this post].<br />
<br />
==== Why is the wiki missing many contest questions? ====<br />
:Generally, it is because users have not yet posted them onto the wiki (translation difficulties, not having access to the actual problems, lack of interest, etc). If you have a copy, please post the problems in the Community Section! In some cases, however, problems may be missing due to copyright claims from maths organizations. See, for example, [http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1391106#p1391106 this post].<br />
<br />
==== What if I find an error on a problem? ====<br />
:Please post an accurate description of the problem in [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=133&t=426693 this thread]. If the problem is on the wiki, you can edit it yourself.<br />
<br />
== LaTeX and Asymptote ==<br />
==== What is LaTeX, and how do I use it? ====<br />
<br />
:<math>\LaTeX</math> is a typesetting markup language that is useful to produce properly formatted mathematical and scientific expressions.<br />
<br />
==== How can I download LaTeX to use on the forums? ====<br />
<br />
:There are no downloads necessary; the forums and the wiki render LaTeX commands between dollar signs. <br />
<br />
==== How can I download LaTeX for personal use? ====<br />
:You can download TeXstudio [http://texstudio.sourceforge.net here] or TeXnicCenter [http://www.texniccenter.org here]<br />
<br />
==== Where can I find a list of LaTeX commands? ====<br />
:See [[LaTeX:Symbols|here]].<br />
<br />
==== Where can I test LaTeX commands? ====<br />
<br />
:[[A:SAND|Sandbox]] or [http://www.artofproblemsolving.com/Resources/texer.php TeXeR]. You can also use our [http://artofproblemsolving.com/community/c67_test_forum Test Forum].<br />
<br />
==== Where can I find examples of Asymptote diagrams and code? ====<br />
<br />
:Search this wiki for the <tt><nowiki><asy></nowiki></tt> tag or the Forums for the <tt><nowiki>[asy]</nowiki></tt> tag. See also [[Asymptote:_Useful_commands_and_their_Output|these examples]] and [[Proofs without words|this article]] (click on the images to obtain the code).<br />
<br />
==== How can I draw 3D diagrams? ====<br />
<br />
:See [[Asymptote: 3D graphics]].<br />
<br />
==== What is the cse5 package? ==== <br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=149650 here]. The package contains a set of shorthand commands that implement the behavior of usual commands, for example <tt>D()</tt> for <tt>draw()</tt> and <tt>dot()</tt>, and so forth.<br />
<br />
==== What is the olympiad package? ====<br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=165767 here]. The package contains a set of commands useful for drawing diagrams related to [[:Category:Olympiad Geometry Problems|olympiad geometry problems]].<br />
<br />
== AoPSWiki ==<br />
==== Is there a guide for wiki syntax? ====<br />
<br />
:See [http://en.wikipedia.org/wiki/Help:Wiki_markup wiki markup], [[AoPSWiki:Tutorial]], and [[Help:Contents]].<br />
<br />
==== What do I do if I see a mistake in the wiki? ====<br />
<br />
:Edit the page and correct the error! You can edit most pages on the wiki. Click the "edit" button on the right sidebar to edit a page.<br />
<br />
==== Why can't I edit the wiki? ====<br />
<br />
:You must be a registered user on Aops to edit. To be registered, make sure you give a correct email, and activate your account.<br />
<br />
== Miscellaneous ==<br />
==== Is it possible to join the AoPS Staff? ====<br />
<br />
:Yes. Mr. Rusczyk will sometimes hire a small army of college students to work as interns, graders, and teaching assistants. You must be at least in your second semester of your senior year and be legal to work in the U.S. (at least 16).<br />
<br />
==== What is the minimum age to be an assistant in an Art of Problem Solving class? ====<br />
<br />
:You must have graduated from high school, or at least be in the second term of your senior year.<br />
<br />
==AoPS Acronyms==<br />
*'''AFK'''- Away from keyboard<br />
*'''AoPS'''- Art of Problem Solving, the website you're on right now!<br />
*'''AIME'''- American Invitational Mathematics Examination<br />
*'''AMC'''- American Math Competitions<br />
*'''ATM'''- At the Moment<br />
*'''brb'''- Be right Back<br />
*'''BTW'''- By the way<br />
*'''CEMC''' - Centre for Mathematics and Computing<br />
*'''C&P or C+P''' - Counting and Probability or Contests and Programs<br />
*'''EBWOP'''- Editing by way of post<br />
*'''FTW'''- For the Win, a game on AoPS<br />
*'''gg'''- Good Game<br />
*'''gj'''- Good Job<br />
*'''glhf'''-Good Luck Have Fun<br />
*'''gtg''' - Got to go<br />
*'''ID(R)K'''-I Don't (Really) Know<br />
*'''iff'''-If and only if<br />
*'''IIRC'''- If I recall correctly<br />
*'''IKR'''- I know right?<br />
*'''IMO'''- In my opinion (or International Math Olympiad, depending on context)<br />
*'''JMO'''- United States of America Junior Mathematical Olympiad<br />
*'''lol'''- Laugh Out Loud<br />
*'''MC'''- Mathcounts, a popular math contest for Middle School students.<br />
*'''MOP'''- Mathematical Olympiad (Summer) Program<br />
*'''MSM'''- Middle School Math<br />
*'''NT'''- Number Theory<br />
*'''OBC'''- Online by computer<br />
*'''OMG'''- Oh My Gosh.<br />
*'''OP'''- Original Poster/Original Post/Original Problem, or Overpowered/Overpowering<br />
*'''QED'''- Quod erat demonstrandum, Latin for Which was to be proven; some English mathematicians use it as an acronym for Quite Elegantly Done<br />
*'''QS&A'''- Questions, Suggestions, and Announcements Forum<br />
*'''ro(t)fl''' - Rolling on the floor laughing<br />
*'''smh''' - Shaking my head<br />
*'''Sticky'''- A post pinned to the top of a forum - a thing no one reads but really should read<br />
*'''TOS'''- Terms of Service - a thing no one reads but really should read<br />
*'''USA(J)MO'''- USA (Junior) Mathematical Olympiad<br />
*'''V/LA'''- Vacation or Long Absence/Limited Access<br />
*'''WLOG'''- Without loss of generality<br />
*'''wrt'''- With respect to<br />
*'''wtg''' - Way to go<br />
*'''tytia'''- Thank you, that is all<br />
*'''xD'''- Bursting Laugh<br />
<br />
== FTW! ==<br />
<br />
Please see the [//artofproblemsolving.com/ftw/faq For the Win! FAQ] for many common questions.<br />
<br />
== School ==<br />
<br />
==== What if I miss a class? ====<br />
:There are classroom transcripts available under My Classes, available at the top right of the web site. You can view these transcripts in order to review any missed material. You can also ask questions on the class message board. Don't worry, though, classroom participation usually isn't weighted heavily.<br />
<br />
==== Is there audio or video in class? ====<br />
:There is generally no audio or video in the class. The classes are generally text and image based, in an interactive chat room environment, which allows students to ask questions at any time during the class. In addition to audio and video limiting interactivity and being less pedagogically effective, the technology isn't quite there yet for all students to be able to adequately receive streaming audio and video.<br />
<br />
==== What if I want to drop out of a class? ====<br />
:For any course with more than 2 classes, students can drop the course any time before the third class begins and receive a full refund. No drops are allowed after the third class has started. To drop the class, go to the My Classes section by clicking the My Classes link at the top-right of the website. Then find the area on the right side of the page that lets you drop the class. A refund will be processed within 10 business days.<br />
<br />
==== For my homework, there is suppose to be a green bar but it's orange, why? ====<br />
<br />
:For the bar to turn green, the writing problem must be attempted. Once it is attempted the bar will turn green.<br />
<br />
==== I need more time for my homework, what should I do? ====<br />
<br />
:There is a "Request Extension" button in the homework tab of your class. This will automatically extend the due date to 2 days after the normal deadline. If you want more time you need to ask for it in the little comment box, stating the reason why you want the extension, and how much time you want. This request will be looked at by the teachers and they will decide if you get the extension or not. Note that you can only use this button 3 times.<br />
:Otherwise, you can send an email to extensions@aops.com with your username, class name and ID, if known, and reason for extension. Someone should get back to you within a couple days.</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=2016_AMC_12A_Problems/Problem_9&diff=862642016 AMC 12A Problems/Problem 92017-07-04T23:53:56Z<p>Wlm2: /* Solution */</p>
<hr />
<div>==Problem 9==<br />
<br />
The five small shaded squares inside this unit square are congruent and have disjoint interiors. The midpoint of each side of the middle square coincides with one of the vertices of the other four small squares as shown. The common side length is <math>\tfrac{a-\sqrt{2}}{b}</math>, where <math>a</math> and <math>b</math> are positive integers. What is <math>a+b</math> ?<br />
<br />
<asy><br />
real x=.369;<br />
draw((0,0)--(0,1)--(1,1)--(1,0)--cycle);<br />
filldraw((0,0)--(0,x)--(x,x)--(x,0)--cycle, gray);<br />
filldraw((0,1)--(0,1-x)--(x,1-x)--(x,1)--cycle, gray);<br />
filldraw((1,1)--(1,1-x)--(1-x,1-x)--(1-x,1)--cycle, gray);<br />
filldraw((1,0)--(1,x)--(1-x,x)--(1-x,0)--cycle, gray);<br />
filldraw((.5,.5-x*sqrt(2)/2)--(.5+x*sqrt(2)/2,.5)--(.5,.5+x*sqrt(2)/2)--(.5-x*sqrt(2)/2,.5)--cycle, gray);<br />
</asy><br />
<br />
<math>\textbf{(A)}\ 7\qquad\textbf{(B)}\ 8\qquad\textbf{(C)}\ 9\qquad\textbf{(D)}\ 10\qquad\textbf{(E)}\ 11</math><br />
<br />
==Solution==<br />
<br />
Let <math>s</math> be the side length of the small squares.<br />
<br />
The diagonal of the big square can be written in two ways: <math>\sqrt{2}</math> and <math>s \sqrt{2} + s + s \sqrt{2}</math>.<br />
<br />
Solving for <math>s</math>, we get <math>s = \frac{4 - \sqrt{2}}{7}</math>, so our answer is <math>4 + 7 \Rightarrow \boxed{\textbf{(E) } 11}</math><br />
<br />
==See Also==<br />
{{AMC12 box|year=2016|ab=A|num-b=8|num-a=10}}<br />
{{MAA Notice}}</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=LaTeX:Symbols&diff=79706LaTeX:Symbols2016-07-26T19:54:50Z<p>Wlm2: /* Command Symbols */</p>
<hr />
<div>{{Latex}}<br />
<br />
This article will provide a short list of commonly used LaTeX symbols. <br />
<br />
== Common Symbols ==<br />
<br />
=== Operators ===<br />
<br />
=== Relations ===<br />
<br />
== Finding Other Symbols ==<br />
<br />
Here are some external resources for finding less commonly used symbols:<br />
<ul><br />
<li><br />
[http://detexify.kirelabs.org/classify.html Detexify] is an app which allows you to draw the symbol you'd like and shows you the <math>\LaTeX</math> code for it!<br />
<br/><br/></li><br />
<br />
<li><br />
MathJax (what allows us to use <math>\LaTeX</math> on the web) maintains a [http://docs.mathjax.org/en/latest/tex.html#supported-latex-commands list of supported commands].<br />
<br/><br/></li><br />
<br />
<li><br />
[http://mirrors.ctan.org/info/symbols/comprehensive/symbols-a4.pdf The Comprehensive LaTeX Symbol List].<br />
<br/><br/></li><br />
</ul><br />
<br />
-------------------------------------------------------------------------------------------------------------<br />
<br />
==Operators==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\pm</math>||\pm||<math>\mp</math>||\mp||<math>\times</math>||\times<br />
|-<br />
|<math>\div</math>||\div||<math>\cdot</math>||\cdot||<math>\ast</math>||\ast<br />
|-<br />
|<math>\star</math>||\star||<math>\dagger</math>||\dagger||<math>\ddagger</math>||\ddagger<br />
|-<br />
|<math>\amalg</math>||\amalg||<math>\cap</math>||\cap||<math>\cup</math>||\cup<br />
|-<br />
|<math>\uplus</math>||\uplus||<math>\sqcap</math>||\sqcap||<math>\sqcup</math>||\sqcup<br />
|-<br />
|<math>\vee</math>||\vee||<math>\wedge</math>||\wedge||<math>\oplus</math>||\oplus<br />
|-<br />
|<math>\ominus</math>||\ominus||<math>\otimes</math>||\otimes||<math>\circ</math>||\circ<br />
|-<br />
|<math>\bullet</math>||\bullet||<math>\diamond</math>||\diamond||<math>\lhd</math>||\lhd<br />
|-<br />
|<math>\rhd</math>||\rhd||<math>\unlhd</math>||\unlhd||[[Image:Unrhd.gif]]||\unrhd<br />
|-<br />
|<math>\oslash</math>||\oslash||<math>\odot</math>||\odot||<math>\bigcirc</math>||\bigcirc<br />
|-<br />
|<math>\triangleleft</math>||\triangleleft||<math>\Diamond</math>||\Diamond||<math>\bigtriangleup</math>||\bigtriangleup<br />
|-<br />
|<math>\bigtriangledown</math>||\bigtriangledown||<math>\Box</math>||\Box||<math>\triangleright</math>||\triangleright<br />
|-<br />
|<math>\setminus</math>||\setminus||<math>\wr</math>||\wr||<math>\sqrt{x}</math>||\sqrt{x}<br />
|-<br />
|<math>x^{\circ}</math>||x^{\circ}||<math>\triangledown</math>||\triangledown||<math>\sqrt[n]{x}</math>||\sqrt[n]{x}<br />
|-<br />
|<math>a^x</math>||a^x||<math>a^{xyz}</math>||a^{xyz}<br />
|}<br />
<br />
==Relations==<br />
{| class="latextable"<br />
!Symbol !! Command !!Symbol !! Command!!Symbol !! Command<br />
|-<br />
| <math>\le</math>||\le||<math>\ge</math>||\ge||<math>\neq</math>||\neq<br />
|-<br />
| <math>\sim</math>||\sim||<math>\ll</math>||\ll||<math>\gg</math>||\gg<br />
|-<br />
| <math>\doteq</math>||\doteq||<math>\simeq</math>||\simeq||<math>\subset</math>||\subset<br />
|-<br />
| <math>\supset</math>||\supset||<math>\approx</math>||\approx||<math>\asymp</math>||\asymp<br />
|-<br />
| <math>\subseteq</math>||\subseteq||<math>\supseteq</math>||\supseteq||<math>\cong</math>||\cong<br />
|-<br />
| <math>\smile</math>||\smile||<math>\sqsubset</math>||\sqsubset||<math>\sqsupset</math>||\sqsupset<br />
|-<br />
| <math>\equiv</math>||\equiv||<math>\frown</math>||\frown||<math>\sqsubseteq</math>||\sqsubseteq<br />
|-<br />
| <math>\sqsupseteq</math>||\sqsupseteq||<math>\propto</math>||\propto||<math>\bowtie</math>||\bowtie<br />
|-<br />
| <math>\in</math>||\in||<math>\ni</math>||\ni||<math>\prec</math>||\prec<br />
|-<br />
| <math>\succ</math>||\succ||<math>\vdash</math>||\vdash||<math>\dashv</math>||\dashv<br />
|-<br />
| <math>\preceq</math>||\preceq||<math>\succeq</math>||\succeq||<math>\models</math>||\models<br />
|-<br />
| <math>\perp</math>||\perp||<math>\parallel</math>||\parallel|| <math>\|</math> |<math>\gg</math>||\gg<br />
|-<br />
| <math>\mid</math>||\mid||<math>\bumpeq</math>||\bumpeq||<math>\ll</math>||\ll<br />
|}<br />
Negations of many of these relations can be formed by just putting \not before the symbol, or by slipping an n between the \ and the word. Here are a few examples, plus a few other negations; it works for many of the others as well.<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\nmid</math>||\nmid||<math>\nleq</math>||\nleq||<math>\ngeq</math>||\ngeq<br />
|-<br />
| <math>\nsim</math>||\nsim||<math>\ncong</math>||\ncong||<math>\nparallel</math>||\nparallel<br />
|-<br />
| <math>\not<</math>||\not<||<math>\not></math>||\not>||<math>\not=</math>||\not=<br />
|-<br />
| <math>\not\le</math>||\not\le||<math>\not\ge</math>||\not\ge||<math>\not\sim</math>||\not\sim<br />
|-<br />
|<math>\not \approx</math>||\not\approx||<math>\not\cong</math>||\not\cong||<math>\not\equiv</math>||\not\equiv<br />
|-<br />
| <math>\not\parallel</math>||\not\parallel||<math>\nless</math>||\nless||<math>\ngtr</math>||\ngtr<br />
|-<br />
| <math>\lneq</math>||\lneq||<math>\gneq</math>||\gneq||<math>\lnsim</math>||\lnsim<br />
|-<br />
| <math>\lneqq</math>||\lneqq||<math>\gneqq</math>||\gneqq<br />
|}<br />
<br />
To use other relations not listed here, such as =, >, and <, in LaTeX, you may just use the symbols on your keyboard.<br />
<br />
==Greek Letters==<br />
{| class="latextable"<br />
|+ Lowercase Letters<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\alpha</math>||\alpha||<math>\beta</math>||\beta||<math>\gamma</math>||\gamma||<math>\delta</math>||\delta<br />
|-<br />
| <math>\epsilon</math>||\epsilon||<math>\varepsilon</math>||\varepsilon||<math>\zeta</math>||\zeta||<math>\eta</math>||\eta<br />
|-<br />
| <math>\theta</math>||\theta||<math>\vartheta</math>||\vartheta||<math>\iota</math>||\iota||<math>\kappa</math>||\kappa<br />
|-<br />
| <math>\lambda</math>||\lambda||<math>\mu</math>||\mu||<math>\nu</math>||\nu||<math>\xi</math>||\xi<br />
|-<br />
|<math>\pi</math>||\pi||<math>\varpi</math>||\varpi||<math>\rho</math>||\rho||<math>\varrho</math>||\varrho<br />
|-<br />
| <math>\sigma</math>||\sigma||<math>\varsigma</math>||\varsigma||<math>\tau</math>||\tau||<math>\upsilon</math>||\upsilon<br />
|-<br />
| <math>\phi</math>||\phi||<math>\varphi</math>||\varphi||<math>\chi</math>||\chi||<math>\psi</math>||\psi<br />
|-<br />
| <math>\omega</math>||\omega<br />
|}<br />
<br />
<br />
{| class="latextable"<br />
|+ Capital Letters<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\Gamma</math>||\Gamma||<math>\Delta</math>||\Delta||<math>\Theta</math>||\Theta||<math>\Lambda</math>||\Lambda<br />
|-<br />
| <math>\Xi</math>||\Xi||<math>\Pi</math>||\Pi||<math>\Sigma</math>||\Sigma||<math>\Upsilon</math>||\Upsilon<br />
|-<br />
| <math>\Phi</math>||\Phi||<math>\Psi</math>||\Psi||<math>\Omega</math>||\Omega<br />
|}<br />
<br />
<br />
== Headline text ==<br />
==Arrows==<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\gets</math>||\gets||<math>\to</math>||\to<br />
|-<br />
|<math>\leftarrow</math>||\leftarrow||<math>\Leftarrow</math>||\Leftarrow<br />
|-<br />
|<math>\rightarrow</math>||\rightarrow||<math>\Rightarrow</math>||\Rightarrow<br />
|-<br />
|<math>\leftrightarrow</math>||\leftrightarrow||<math>\Leftrightarrow</math>||\Leftrightarrow<br />
|-<br />
|<math>\mapsto</math>||\mapsto||<math>\hookleftarrow</math>||\hookleftarrow<br />
|-<br />
|<math>\leftharpoonup</math>||\leftharpoonup||<math>\leftharpoondown</math>||\leftharpoondown<br />
|-<br />
|<math>\rightleftharpoons</math>||\rightleftharpoons||<math>\longleftarrow</math>||\longleftarrow<br />
|-<br />
|<math>\Longleftarrow</math>||\Longleftarrow||<math>\longrightarrow</math>||\longrightarrow<br />
|-<br />
|<math>\Longrightarrow</math>||\Longrightarrow||<math>\longleftrightarrow</math>||\longleftrightarrow<br />
|-<br />
|<math>\Longleftrightarrow</math>||\Longleftrightarrow||<math>\longmapsto</math>||\longmapsto<br />
|-<br />
|<math>\hookrightarrow</math>||\hookrightarrow||<math>\rightharpoonup</math>||\rightharpoonup<br />
|-<br />
|<math>\rightharpoondown</math>||\rightharpoondown||<math>\leadsto</math>||\leadsto<br />
|-<br />
|<math>\uparrow</math>||\uparrow||<math>\Uparrow</math>||\Uparrow<br />
|-<br />
|<math>\downarrow</math>||\downarrow||<math>\Downarrow</math>||\Downarrow<br />
|-<br />
|<math>\updownarrow</math>||\updownarrow||<math>\Updownarrow</math>||\Updownarrow<br />
|-<br />
|<math>\nearrow</math>||\nearrow||<math>\searrow</math>||\searrow<br />
|-<br />
|<math>\swarrow</math>||\swarrow||<math>\nwarrow</math>||\nwarrow<br />
|}<br />
(For those of you who hate typing long strings of letters, \iff and \implies can be used in place of \Longleftrightarrow and \Longrightarrow respectively.)<br />
<br />
==Dots==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|- <br />
|<math>\dots</math>||\dots|| |<math>\vdots</math>||\vdots||<br />
|-<br />
|<math>\cdots</math>||\cdots||<br />
|-<br />
|<math>\ddots</math>||\ddots||<br />
|-<br />
|<math>\iddots</math>||\iddots||<br />
|}<br />
<br />
==Accents==<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\hat{x}</math>||\hat{x}||<math>\check{x}</math>||\check{x}||<math>\dot{x}</math>||\dot{x}<br />
|-<br />
|<math>\breve{x}</math>||\breve{x}||<math>\acute{x}</math>||\acute{x}||<math>\ddot{x}</math>||\ddot{x}<br />
|-<br />
|<math>\grave{x}</math>||\grave{x}||<math>\tilde{x}</math>||\tilde{x}||<math>\mathring{x}</math>||\mathring{x}<br />
|-<br />
|<math>\bar{x}</math>||\bar{x}||<math>\vec{x}</math>||\vec{x}<br />
|}<br />
When applying accents to i and j, you can use \imath and \jmath to keep the dots from interfering with the accents:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\vec{\jmath}</math>||\vec{\jmath}||<math>\tilde{\imath}</math>||\tilde{\imath}<br />
|}<br />
\tilde and \hat have wide versions that allow you to accent an expression:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\widehat{7+x}</math>||\widehat{7+x}||<math>\widetilde{abc}</math>||\widetilde{abc}<br />
|}<br />
<br />
==Others==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command <br />
|-<br />
|<math>\infty</math>||\infty||<math>\triangle</math>||\triangle||<math>\angle</math>||\angle<br />
|-<br />
|<math>\aleph</math>||\aleph||<math>\hbar</math>||\hbar||<math>\imath</math>||\imath<br />
|-<br />
|<math>\jmath</math>||\jmath||<math>\ell</math>||\ell||<math>\wp</math>||\wp<br />
|-<br />
|<math>\Re</math>||\Re||<math>\Im</math>||\Im||<math>\mho</math>||\mho<br />
|-<br />
|<math>\prime</math>||\prime||<math>\emptyset</math>||\emptyset||<math>\nabla</math>||\nabla<br />
|-<br />
|<math>\surd</math>||\surd||<math>\partial</math>||\partial||<math>\top</math>||\top<br />
|-<br />
|<math>\bot</math>||\bot||<math>\vdash</math>||\vdash||<math>\dashv</math>||\dashv<br />
|-<br />
|<math>\forall</math>||\forall||<math>\exists</math>||\exists||<math>\neg</math>||\neg<br />
|-<br />
|<math>\flat</math>||\flat||<math>\natural</math>||\natural||<math>\sharp</math>||\sharp<br />
|-<br />
|<math>\backslash</math>||\backslash||<math>\Box</math>||\Box||<math>\Diamond</math>||\Diamond<br />
|-<br />
|<math>\clubsuit</math>||\clubsuit||<math>\diamondsuit</math>||\diamondsuit||<math>\heartsuit</math>||\heartsuit<br />
|-<br />
|[[Image:Spadesuit.gif]]||\spadesuit||<math>\Join</math>||\Join||<math>\blacksquare</math>||\blacksquare<br />
|-<br />
|<math>\S</math>||\S||<math>\P</math>||\P||<math>\copyright</math>||\copyright<br />
|-<br />
|<math>\pounds</math>||\pounds||<math>\overarc{ABC}</math>||\overarc{ABC}||<math>\underarc{XYZ}</math>||\underarc{XYZ}<br />
|-<br />
|<math>\bigstar</math>||\bigstar||<math>\in</math>||\in||<math>\cup</math>||\cup<br />
|-<br />
|<math>\square</math>||\square||<br />
|-<br />
|<math>\smiley</math>||\smiley||<br />
|-<br />
|<math>\mathbb{R}</math>||\mathbb{R} (represents all real numbers)||<br />
|-<br />
|<math>\checkmark</math>||\checkmark||<br />
|}<br />
<br />
==Command Symbols==<br />
Some symbols are used in commands so they need to be treated in a special way.<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\textdollar</math>||\textdollar or \$||<math>\&</math>||\&||<math>\%</math>||\%||<math>\#</math>||\#<br />
|-<br />
|<math>\_</math>||\_||<math>\{</math>||\{||<math>\}</math>||\}||<math>\backslash</math>||\backslash<br />
|}<br />
<br />
(Warning: Using <nowiki>$</nowiki> for <math>\textdollar</math> will result in <math>\$</math>. This is a bug as far as we know. Depending on the version of <math>\LaTeX</math> this is not always a problem.)<br />
<br />
==European Language Symbols==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>{\oe}</math>||{\oe}||<math>{\ae}</math>||{\ae}||<math>{\o}</math>||{\o}<br />
|-<br />
|<math>{\OE}</math>||{\OE}||<math>{\AE}</math>||{\AE}||<math>{\AA}</math>||{\AA}||<math>{\O}</math>||{\O}<br />
|-<br />
|<math>{\l}</math>||{\l}||<math>{\ss}</math>||{\ss}||<math>\text{!`}</math>||!`<br />
|-<br />
|<math>{\L}</math>||{\L}||<math>{\SS}</math>||{\SS}||<br />
|}<br />
<br />
==Bracketing Symbols==<br />
In mathematics, sometimes we need to enclose expressions in brackets or braces or parentheses. Some of these work just as you'd imagine in LaTeX; type ( and ) for parentheses, [ and ] for brackets, and | and | for absolute value. However, other symbols have special commands:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\{</math>||\{||<math>\}</math>||\}||<math>\|</math>||<nowiki>\|</nowiki><br />
|-<br />
| <math>\backslash</math>||\backslash||<math>\lfloor</math>||\lfloor||<math>\rfloor</math>||\rfloor<br />
|-<br />
| <math>\lceil</math>||\lceil||<math>\rceil</math>||\rceil||<math>\langle</math>||\langle<br />
|-<br />
| <math>\rangle</math>||\rangle<br />
|}<br />
You might notice that if you use any of these to typeset an expression that is vertically large, like<br />
<br />
:<tt>(\frac{a}{x} )^2</tt><br />
<br />
the parentheses don't come out the right size:<br />
<br />
:<math>(\frac{a}{x})^2</math><br />
<br />
If we put \left and \right before the relevant parentheses, we get a prettier expression:<br />
<br />
:<tt>\left(\frac{a}{x} \right)^2</tt><br />
<br />
gives<br />
<br />
:<math>\left(\frac{a}{x} \right)^2</math><br />
<br />
\left and \right can also be used to resize the following symbols:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\uparrow</math>||\uparrow||<math>\downarrow</math>||\downarrow||<math>\updownarrow</math>||\updownarrow<br />
|-<br />
| <math>\Uparrow</math>||\Uparrow||<math>\Downarrow</math>||\Downarrow||<math>\Updownarrow</math>||\Updownarrow<br />
|}<br />
<br />
==Multi-Size Symbols==<br />
Some symbols render differently in inline math mode and in display mode. Display mode occurs when you use <nowiki>\[...\]</nowiki> or <nowiki>$$...$$</nowiki>, or environments like \begin{equation}...\end{equation}, \begin{align}...\end{align}. Read more in the [[LaTeX:Commands|commands]] section of the guide about how symbols which take arguments above and below the symbols, such as a summation symbol, behave in the two modes.<br />
<br />
In each of the following, the two images show the symbol in display mode, then in inline mode.<br />
<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\sum \textstyle\sum</math>||\sum||<math>\int \textstyle\int</math>||\int||<math>\oint \textstyle\oint</math>||\oint<br />
|-<br />
|<math>\prod \textstyle\prod</math>||\prod||<math>\coprod \textstyle\coprod</math>||\coprod||<math>\bigcap \textstyle\bigcap</math>||\bigcap<br />
|-<br />
|<math>\bigcup \textstyle\bigcup</math>||\bigcup||<math>\bigsqcup \textstyle\bigsqcup</math>||\bigsqcup||<math>\bigvee \textstyle\bigvee</math>||\bigvee<br />
|-<br />
|<math>\bigwedge \textstyle\bigwedge</math>||\bigwedge||<math>\bigodot \textstyle\bigodot</math>||\bigodot||<math>\bigotimes \textstyle\bigotimes</math>||\bigotimes<br />
|-<br />
|<math>\bigoplus \textstyle\bigoplus</math>||\bigoplus||<math>\biguplus \textstyle\biguplus</math>||\biguplus<br />
|}<br />
<br />
==See Also==<br />
*[[LaTeX:Commands | Next: Commands]]<br />
*[[LaTeX:Layout | Previous: Layout]]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=LaTeX:Symbols&diff=79468LaTeX:Symbols2016-07-19T01:29:14Z<p>Wlm2: /* Others */</p>
<hr />
<div>{{Latex}}<br />
<br />
This article will provide a short list of commonly used LaTeX symbols. <br />
<br />
== Common Symbols ==<br />
<br />
=== Operators ===<br />
<br />
=== Relations ===<br />
<br />
== Finding Other Symbols ==<br />
<br />
Here are some external resources for finding less commonly used symbols:<br />
<ul><br />
<li><br />
[http://detexify.kirelabs.org/classify.html Detexify] is an app which allows you to draw the symbol you'd like and shows you the <math>\LaTeX</math> code for it!<br />
<br/><br/></li><br />
<br />
<li><br />
MathJax (what allows us to use <math>\LaTeX</math> on the web) maintains a [http://docs.mathjax.org/en/latest/tex.html#supported-latex-commands list of supported commands].<br />
<br/><br/></li><br />
<br />
<li><br />
[http://mirrors.ctan.org/info/symbols/comprehensive/symbols-a4.pdf The Comprehensive LaTeX Symbol List].<br />
<br/><br/></li><br />
</ul><br />
<br />
-------------------------------------------------------------------------------------------------------------<br />
<br />
==Operators==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\pm</math>||\pm||<math>\mp</math>||\mp||<math>\times</math>||\times<br />
|-<br />
|<math>\div</math>||\div||<math>\cdot</math>||\cdot||<math>\ast</math>||\ast<br />
|-<br />
|<math>\star</math>||\star||<math>\dagger</math>||\dagger||<math>\ddagger</math>||\ddagger<br />
|-<br />
|<math>\amalg</math>||\amalg||<math>\cap</math>||\cap||<math>\cup</math>||\cup<br />
|-<br />
|<math>\uplus</math>||\uplus||<math>\sqcap</math>||\sqcap||<math>\sqcup</math>||\sqcup<br />
|-<br />
|<math>\vee</math>||\vee||<math>\wedge</math>||\wedge||<math>\oplus</math>||\oplus<br />
|-<br />
|<math>\ominus</math>||\ominus||<math>\otimes</math>||\otimes||<math>\circ</math>||\circ<br />
|-<br />
|<math>\bullet</math>||\bullet||<math>\diamond</math>||\diamond||<math>\lhd</math>||\lhd<br />
|-<br />
|<math>\rhd</math>||\rhd||<math>\unlhd</math>||\unlhd||[[Image:Unrhd.gif]]||\unrhd<br />
|-<br />
|<math>\oslash</math>||\oslash||<math>\odot</math>||\odot||<math>\bigcirc</math>||\bigcirc<br />
|-<br />
|<math>\triangleleft</math>||\triangleleft||<math>\Diamond</math>||\Diamond||<math>\bigtriangleup</math>||\bigtriangleup<br />
|-<br />
|<math>\bigtriangledown</math>||\bigtriangledown||<math>\Box</math>||\Box||<math>\triangleright</math>||\triangleright<br />
|-<br />
|<math>\setminus</math>||\setminus||<math>\wr</math>||\wr||<math>\sqrt{x}</math>||\sqrt{x}<br />
|-<br />
|<math>x^{\circ}</math>||x^{\circ}||<math>\triangledown</math>||\triangledown||<math>\sqrt[n]{x}</math>||\sqrt[n]{x}<br />
|-<br />
|<math>a^x</math>||a^x||<math>a^{xyz}</math>||a^{xyz}<br />
|}<br />
<br />
==Relations==<br />
{| class="latextable"<br />
!Symbol !! Command !!Symbol !! Command!!Symbol !! Command<br />
|-<br />
| <math>\le</math>||\le||<math>\ge</math>||\ge||<math>\neq</math>||\neq<br />
|-<br />
| <math>\sim</math>||\sim||<math>\ll</math>||\ll||<math>\gg</math>||\gg<br />
|-<br />
| <math>\doteq</math>||\doteq||<math>\simeq</math>||\simeq||<math>\subset</math>||\subset<br />
|-<br />
| <math>\supset</math>||\supset||<math>\approx</math>||\approx||<math>\asymp</math>||\asymp<br />
|-<br />
| <math>\subseteq</math>||\subseteq||<math>\supseteq</math>||\supseteq||<math>\cong</math>||\cong<br />
|-<br />
| <math>\smile</math>||\smile||<math>\sqsubset</math>||\sqsubset||<math>\sqsupset</math>||\sqsupset<br />
|-<br />
| <math>\equiv</math>||\equiv||<math>\frown</math>||\frown||<math>\sqsubseteq</math>||\sqsubseteq<br />
|-<br />
| <math>\sqsupseteq</math>||\sqsupseteq||<math>\propto</math>||\propto||<math>\bowtie</math>||\bowtie<br />
|-<br />
| <math>\in</math>||\in||<math>\ni</math>||\ni||<math>\prec</math>||\prec<br />
|-<br />
| <math>\succ</math>||\succ||<math>\vdash</math>||\vdash||<math>\dashv</math>||\dashv<br />
|-<br />
| <math>\preceq</math>||\preceq||<math>\succeq</math>||\succeq||<math>\models</math>||\models<br />
|-<br />
| <math>\perp</math>||\perp||<math>\parallel</math>||\parallel|| <math>\|</math> |<math>\gg</math>||\gg<br />
|-<br />
| <math>\mid</math>||\mid||<math>\bumpeq</math>||\bumpeq||<math>\ll</math>||\ll<br />
|}<br />
Negations of many of these relations can be formed by just putting \not before the symbol, or by slipping an n between the \ and the word. Here are a few examples, plus a few other negations; it works for many of the others as well.<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\nmid</math>||\nmid||<math>\nleq</math>||\nleq||<math>\ngeq</math>||\ngeq<br />
|-<br />
| <math>\nsim</math>||\nsim||<math>\ncong</math>||\ncong||<math>\nparallel</math>||\nparallel<br />
|-<br />
| <math>\not<</math>||\not<||<math>\not></math>||\not>||<math>\not=</math>||\not=<br />
|-<br />
| <math>\not\le</math>||\not\le||<math>\not\ge</math>||\not\ge||<math>\not\sim</math>||\not\sim<br />
|-<br />
|<math>\not \approx</math>||\not\approx||<math>\not\cong</math>||\not\cong||<math>\not\equiv</math>||\not\equiv<br />
|-<br />
| <math>\not\parallel</math>||\not\parallel||<math>\nless</math>||\nless||<math>\ngtr</math>||\ngtr<br />
|-<br />
| <math>\lneq</math>||\lneq||<math>\gneq</math>||\gneq||<math>\lnsim</math>||\lnsim<br />
|-<br />
| <math>\lneqq</math>||\lneqq||<math>\gneqq</math>||\gneqq<br />
|}<br />
<br />
To use other relations not listed here, such as =, >, and <, in LaTeX, you may just use the symbols on your keyboard.<br />
<br />
==Greek Letters==<br />
{| class="latextable"<br />
|+ Lowercase Letters<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\alpha</math>||\alpha||<math>\beta</math>||\beta||<math>\gamma</math>||\gamma||<math>\delta</math>||\delta<br />
|-<br />
| <math>\epsilon</math>||\epsilon||<math>\varepsilon</math>||\varepsilon||<math>\zeta</math>||\zeta||<math>\eta</math>||\eta<br />
|-<br />
| <math>\theta</math>||\theta||<math>\vartheta</math>||\vartheta||<math>\iota</math>||\iota||<math>\kappa</math>||\kappa<br />
|-<br />
| <math>\lambda</math>||\lambda||<math>\mu</math>||\mu||<math>\nu</math>||\nu||<math>\xi</math>||\xi<br />
|-<br />
|<math>\pi</math>||\pi||<math>\varpi</math>||\varpi||<math>\rho</math>||\rho||<math>\varrho</math>||\varrho<br />
|-<br />
| <math>\sigma</math>||\sigma||<math>\varsigma</math>||\varsigma||<math>\tau</math>||\tau||<math>\upsilon</math>||\upsilon<br />
|-<br />
| <math>\phi</math>||\phi||<math>\varphi</math>||\varphi||<math>\chi</math>||\chi||<math>\psi</math>||\psi<br />
|-<br />
| <math>\omega</math>||\omega<br />
|}<br />
<br />
<br />
{| class="latextable"<br />
|+ Capital Letters<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\Gamma</math>||\Gamma||<math>\Delta</math>||\Delta||<math>\Theta</math>||\Theta||<math>\Lambda</math>||\Lambda<br />
|-<br />
| <math>\Xi</math>||\Xi||<math>\Pi</math>||\Pi||<math>\Sigma</math>||\Sigma||<math>\Upsilon</math>||\Upsilon<br />
|-<br />
| <math>\Phi</math>||\Phi||<math>\Psi</math>||\Psi||<math>\Omega</math>||\Omega<br />
|}<br />
<br />
<br />
== Headline text ==<br />
==Arrows==<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\gets</math>||\gets||<math>\to</math>||\to<br />
|-<br />
|<math>\leftarrow</math>||\leftarrow||<math>\Leftarrow</math>||\Leftarrow<br />
|-<br />
|<math>\rightarrow</math>||\rightarrow||<math>\Rightarrow</math>||\Rightarrow<br />
|-<br />
|<math>\leftrightarrow</math>||\leftrightarrow||<math>\Leftrightarrow</math>||\Leftrightarrow<br />
|-<br />
|<math>\mapsto</math>||\mapsto||<math>\hookleftarrow</math>||\hookleftarrow<br />
|-<br />
|<math>\leftharpoonup</math>||\leftharpoonup||<math>\leftharpoondown</math>||\leftharpoondown<br />
|-<br />
|<math>\rightleftharpoons</math>||\rightleftharpoons||<math>\longleftarrow</math>||\longleftarrow<br />
|-<br />
|<math>\Longleftarrow</math>||\Longleftarrow||<math>\longrightarrow</math>||\longrightarrow<br />
|-<br />
|<math>\Longrightarrow</math>||\Longrightarrow||<math>\longleftrightarrow</math>||\longleftrightarrow<br />
|-<br />
|<math>\Longleftrightarrow</math>||\Longleftrightarrow||<math>\longmapsto</math>||\longmapsto<br />
|-<br />
|<math>\hookrightarrow</math>||\hookrightarrow||<math>\rightharpoonup</math>||\rightharpoonup<br />
|-<br />
|<math>\rightharpoondown</math>||\rightharpoondown||<math>\leadsto</math>||\leadsto<br />
|-<br />
|<math>\uparrow</math>||\uparrow||<math>\Uparrow</math>||\Uparrow<br />
|-<br />
|<math>\downarrow</math>||\downarrow||<math>\Downarrow</math>||\Downarrow<br />
|-<br />
|<math>\updownarrow</math>||\updownarrow||<math>\Updownarrow</math>||\Updownarrow<br />
|-<br />
|<math>\nearrow</math>||\nearrow||<math>\searrow</math>||\searrow<br />
|-<br />
|<math>\swarrow</math>||\swarrow||<math>\nwarrow</math>||\nwarrow<br />
|}<br />
(For those of you who hate typing long strings of letters, \iff and \implies can be used in place of \Longleftrightarrow and \Longrightarrow respectively.)<br />
<br />
==Dots==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|- <br />
|<math>\dots</math>||\dots|| |<math>\vdots</math>||\vdots||<br />
|-<br />
|<math>\cdots</math>||\cdots||<br />
|-<br />
|<math>\ddots</math>||\ddots||<br />
|-<br />
|<math>\iddots</math>||\iddots||<br />
|}<br />
<br />
==Accents==<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\hat{x}</math>||\hat{x}||<math>\check{x}</math>||\check{x}||<math>\dot{x}</math>||\dot{x}<br />
|-<br />
|<math>\breve{x}</math>||\breve{x}||<math>\acute{x}</math>||\acute{x}||<math>\ddot{x}</math>||\ddot{x}<br />
|-<br />
|<math>\grave{x}</math>||\grave{x}||<math>\tilde{x}</math>||\tilde{x}||<math>\mathring{x}</math>||\mathring{x}<br />
|-<br />
|<math>\bar{x}</math>||\bar{x}||<math>\vec{x}</math>||\vec{x}<br />
|}<br />
When applying accents to i and j, you can use \imath and \jmath to keep the dots from interfering with the accents:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\vec{\jmath}</math>||\vec{\jmath}||<math>\tilde{\imath}</math>||\tilde{\imath}<br />
|}<br />
\tilde and \hat have wide versions that allow you to accent an expression:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\widehat{7+x}</math>||\widehat{7+x}||<math>\widetilde{abc}</math>||\widetilde{abc}<br />
|}<br />
<br />
==Others==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command <br />
|-<br />
|<math>\infty</math>||\infty||<math>\triangle</math>||\triangle||<math>\angle</math>||\angle<br />
|-<br />
|<math>\aleph</math>||\aleph||<math>\hbar</math>||\hbar||<math>\imath</math>||\imath<br />
|-<br />
|<math>\jmath</math>||\jmath||<math>\ell</math>||\ell||<math>\wp</math>||\wp<br />
|-<br />
|<math>\Re</math>||\Re||<math>\Im</math>||\Im||<math>\mho</math>||\mho<br />
|-<br />
|<math>\prime</math>||\prime||<math>\emptyset</math>||\emptyset||<math>\nabla</math>||\nabla<br />
|-<br />
|<math>\surd</math>||\surd||<math>\partial</math>||\partial||<math>\top</math>||\top<br />
|-<br />
|<math>\bot</math>||\bot||<math>\vdash</math>||\vdash||<math>\dashv</math>||\dashv<br />
|-<br />
|<math>\forall</math>||\forall||<math>\exists</math>||\exists||<math>\neg</math>||\neg<br />
|-<br />
|<math>\flat</math>||\flat||<math>\natural</math>||\natural||<math>\sharp</math>||\sharp<br />
|-<br />
|<math>\backslash</math>||\backslash||<math>\Box</math>||\Box||<math>\Diamond</math>||\Diamond<br />
|-<br />
|<math>\clubsuit</math>||\clubsuit||<math>\diamondsuit</math>||\diamondsuit||<math>\heartsuit</math>||\heartsuit<br />
|-<br />
|[[Image:Spadesuit.gif]]||\spadesuit||<math>\Join</math>||\Join||<math>\blacksquare</math>||\blacksquare<br />
|-<br />
|<math>\S</math>||\S||<math>\P</math>||\P||<math>\copyright</math>||\copyright<br />
|-<br />
|<math>\pounds</math>||\pounds||<math>\overarc{ABC}</math>||\overarc{ABC}||<math>\underarc{XYZ}</math>||\underarc{XYZ}<br />
|-<br />
|<math>\bigstar</math>||\bigstar||<math>\in</math>||\in||<math>\cup</math>||\cup<br />
|-<br />
|<math>\square</math>||\square||<br />
|-<br />
|<math>\smiley</math>||\smiley||<br />
|-<br />
|<math>\mathbb{R}</math>||\mathbb{R} (represents all real numbers)||<br />
|-<br />
|<math>\checkmark</math>||\checkmark||<br />
|}<br />
<br />
==Command Symbols==<br />
Some symbols are used in commands so they need to be treated in a special way.<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\textdollar</math>||\textdollar||<math>\&</math>||\&||<math>\%</math>||\%||<math>\#</math>||\#<br />
|-<br />
|<math>\_</math>||\_||<math>\{</math>||\{||<math>\}</math>||\}||<math>\backslash</math>||\backslash<br />
|}<br />
<br />
(Warning: Using <nowiki>$</nowiki> for <math>\textdollar</math> will result in <math>\$</math>. This is a bug as far as we know. Depending on the version of <math>\LaTeX</math> this is not always a problem.)<br />
<br />
==European Language Symbols==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>{\oe}</math>||{\oe}||<math>{\ae}</math>||{\ae}||<math>{\o}</math>||{\o}<br />
|-<br />
|<math>{\OE}</math>||{\OE}||<math>{\AE}</math>||{\AE}||<math>{\AA}</math>||{\AA}||<math>{\O}</math>||{\O}<br />
|-<br />
|<math>{\l}</math>||{\l}||<math>{\ss}</math>||{\ss}||<math>\text{!`}</math>||!`<br />
|-<br />
|<math>{\L}</math>||{\L}||<math>{\SS}</math>||{\SS}||<br />
|}<br />
<br />
==Bracketing Symbols==<br />
In mathematics, sometimes we need to enclose expressions in brackets or braces or parentheses. Some of these work just as you'd imagine in LaTeX; type ( and ) for parentheses, [ and ] for brackets, and | and | for absolute value. However, other symbols have special commands:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\{</math>||\{||<math>\}</math>||\}||<math>\|</math>||<nowiki>\|</nowiki><br />
|-<br />
| <math>\backslash</math>||\backslash||<math>\lfloor</math>||\lfloor||<math>\rfloor</math>||\rfloor<br />
|-<br />
| <math>\lceil</math>||\lceil||<math>\rceil</math>||\rceil||<math>\langle</math>||\langle<br />
|-<br />
| <math>\rangle</math>||\rangle<br />
|}<br />
You might notice that if you use any of these to typeset an expression that is vertically large, like<br />
<br />
:<tt>(\frac{a}{x} )^2</tt><br />
<br />
the parentheses don't come out the right size:<br />
<br />
:<math>(\frac{a}{x})^2</math><br />
<br />
If we put \left and \right before the relevant parentheses, we get a prettier expression:<br />
<br />
:<tt>\left(\frac{a}{x} \right)^2</tt><br />
<br />
gives<br />
<br />
:<math>\left(\frac{a}{x} \right)^2</math><br />
<br />
\left and \right can also be used to resize the following symbols:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\uparrow</math>||\uparrow||<math>\downarrow</math>||\downarrow||<math>\updownarrow</math>||\updownarrow<br />
|-<br />
| <math>\Uparrow</math>||\Uparrow||<math>\Downarrow</math>||\Downarrow||<math>\Updownarrow</math>||\Updownarrow<br />
|}<br />
<br />
==Multi-Size Symbols==<br />
Some symbols render differently in inline math mode and in display mode. Display mode occurs when you use <nowiki>\[...\]</nowiki> or <nowiki>$$...$$</nowiki>, or environments like \begin{equation}...\end{equation}, \begin{align}...\end{align}. Read more in the [[LaTeX:Commands|commands]] section of the guide about how symbols which take arguments above and below the symbols, such as a summation symbol, behave in the two modes.<br />
<br />
In each of the following, the two images show the symbol in display mode, then in inline mode.<br />
<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\sum \textstyle\sum</math>||\sum||<math>\int \textstyle\int</math>||\int||<math>\oint \textstyle\oint</math>||\oint<br />
|-<br />
|<math>\prod \textstyle\prod</math>||\prod||<math>\coprod \textstyle\coprod</math>||\coprod||<math>\bigcap \textstyle\bigcap</math>||\bigcap<br />
|-<br />
|<math>\bigcup \textstyle\bigcup</math>||\bigcup||<math>\bigsqcup \textstyle\bigsqcup</math>||\bigsqcup||<math>\bigvee \textstyle\bigvee</math>||\bigvee<br />
|-<br />
|<math>\bigwedge \textstyle\bigwedge</math>||\bigwedge||<math>\bigodot \textstyle\bigodot</math>||\bigodot||<math>\bigotimes \textstyle\bigotimes</math>||\bigotimes<br />
|-<br />
|<math>\bigoplus \textstyle\bigoplus</math>||\bigoplus||<math>\biguplus \textstyle\biguplus</math>||\biguplus<br />
|}<br />
<br />
==See Also==<br />
*[[LaTeX:Commands | Next: Commands]]<br />
*[[LaTeX:Layout | Previous: Layout]]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=Base_arithmetic&diff=79283Base arithmetic2016-07-13T00:14:55Z<p>Wlm2: /* Base Addition */</p>
<hr />
<div><br />
==Base Addition==<br />
Addition in other bases occurs very similarly to Base 10 addition. The difference lies in carrying. For instance, if we were adding<br />
===Example===<br />
<br />
==Base Subtraction==<br />
===Example===<br />
==Base Multiplication==<br />
===Example===<br />
==Base Division==<br />
===Example===</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=Base_arithmetic&diff=79282Base arithmetic2016-07-13T00:13:42Z<p>Wlm2: </p>
<hr />
<div><br />
==Base Addition==<br />
Addition in other bases occurs very similarly to Base 10<br />
===Example===<br />
==Base Subtraction==<br />
===Example===<br />
==Base Multiplication==<br />
===Example===<br />
==Base Division==<br />
===Example===</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=Getting_Started_With_Python_Programming&diff=79281Getting Started With Python Programming2016-07-13T00:02:44Z<p>Wlm2: /* What's Next? */</p>
<hr />
<div>This guide takes you through the process of getting started with programming using the Python programming language. The sections flow from one to the next so it's recommended to read through this document in order from top to bottom.<br />
<br />
=Installing Python=<br />
<br />
Python is a very useful and popular computer language. Confusingly, Python has two major versions (2 and 3) and they are not fully compatible. We recommend using the most recent release of version 3. (This is the version that our [http://www.artofproblemsolving.com/School/courseinfo.php?course_id=python1 Introduction to Programming with Python course] uses -- if you are enrolled in that class, you '''must''' have Python 3.) There is absolutely nothing wrong with Python 2, as it is what most of today's technology supports and uses, but Python 3 is well on the way of replacing Python 2, so it will be more useful in a few years.<br />
<br />
Python is open-source software and is '''free''' to install and use. Here are installation instructions:<br />
<br />
#Go to the Python download page at http://www.python.org/download. Near the top of the page, there will be a list of download links for the Python 3.5.* installer. (The * will be replaced by a number -- as of mid-September 2015 the version is 3.5.0.) Click on the link that corresponds to your computer type (Windows or Mac, 32-bit or 64-bit -- if you're not sure, use the 32-bit version.) Some browsers will save the file automatically, others may pop up a box asking you if you want to save the file, in which case you should click the "save file" option. Depending on how your browser is configured, you may be asked where to save the file. If this is the case, keep track of where you save the installer.<br />
#Find where the installer was downloaded and double click on it to run it. On most browsers, you should simply be able to double-click the installer from the browser's "Downloads" window or menu. You may also have to click "Run" or "Yes" to a security window -- do this if necessary.<br />
#The setup wizard should launch. You should just click "Next" for every option in the setup wizard (i.e. use the defaults), unless you have some specific reason not to.<br />
#Familiarize yourself with the Python shell and IDLE text editor by running through the two sections below.<br />
<br />
=Using the Python Shell=<br />
The program that you'll use to run Python is called IDLE. It may be listed on your computer as "IDLE (Python GUI)". <br />
* On a Mac, IDLE should be in the Applications folder. <br />
* On Windows, IDLE should be accessible from the Start menu in a folder named "Python z5" (or something similar).<br />
The icon for IDLE looks something like this [[File:Idleicon.png]] or this [[File:Idleiconmac.png]]<br />
<br />
When you first open IDLE, you'll see the Python Shell (the numbers on your shell might be different than those shown below): <br />
<br />
[[File:Idle2-1.png]]<br />
<br />
(The screenshots in this article are taken using IDLE on a Mac with the font increased. Thus IDLE may look a little bit different for you but should still function similarly.)<br />
<br />
Note that the first line is the version of Python, which is 3.1.2 in the screenshot but should be 3.5.something if you installed it as directed above. Another thing to note is that in the lower right hand corner of the Python Shell you can see that it says "Ln: 4 Col: 4". This is just telling you where in the document your cursor is. In this case it's on line 4 and over in column 4. (The line and column number may be slightly different for your installation.)<br />
<br />
When you first start up Python on a Mac, you might get the following warning:<br />
: >>> WARNING: The version of Tcl/Tk (8.5.9) in use may be unstable.<br />
: Visit http://www.python.org/download/mac/tcltk/ for current information.<br />
If you get this warning, you'll need to update a graphics driver on your computer. Follow the link shown above and download and install the ActiveTcl driver that's recommended for the version of OS X that your Mac is running. This most likely will be 8.5.15.0, which you can also download directly from http://www.activestate.com/activetcl/downloads (IMPORTANT: you only need to do this step if you get the warning printed above when you start IDLE for the first time. If you don't get the warning, then everything is good to go.)<br />
<br />
<br />
The Python Shell is very useful for quick one-liners and short sequences of commands:<br />
<br />
[[File:Idle2-2.2.png]]<br />
<br />
Here we see a number of familiar operations: + for addition, - for subtraction, * for multiplication, and / for division. The last operation shown in the example, denoted by **, happens to be exponentiation. One neat feature to note about Python is that it can store arbitrarily large numbers (limited by the amount of memory your computer has). Trying some hefty exponentiation, we can see that we can compute with some pretty big numbers such as <math>2^{1000}</math> as illustrated below.<br />
<br />
[[File:Idle2-3.png]]<br />
<br />
While Python can make for a pretty good calculator, it can do a whole lot more. One example is when dealing with strings as follows:<br />
<br />
[[File:Idle2-4.png]]<br />
<br />
Here we are concatenating the three strings "python", "is", and "cool" by using the + operator. Notice that previously we used + to add numbers but now with strings, Python concatenates them! You may also note that the output of the operation gives us a string with single quotes around it. In Python, you are able to use single quotes or double quotes to denote a string. You can use them interchangeably.<br />
<br />
As a final example, we can even write code in the Python Shell that extends beyond a single line as shown below. We also see our first example of a <math>\verb=for=</math> loop.<br />
<br />
[[File:Idle2-5.png]]<br />
<br />
As you type the above, the Python Shell will automatically indent the second line for you. To let the Python Shell know that you're done and are ready for it to run your code, you'll need to put in an extra blank line by hitting the Enter key again. At that point it should run your code and print your output.<br />
<br />
Take some time to play around with the Python Shell. You'll want to go through a more extensive introduction to programming to learn the full extent of what you can do with Python, but you can still do some pretty nifty stuff by just playing around. The Python Shell also has an extensive built-in help system -- just type '''help()''' at the ">>>" prompt to get started and then follow the instructions it gives you.<br />
<br />
=The IDLE Text Editor and Your First Python Program=<br />
For most programming needs, you'll want to edit your program in a separate document and then run it. Happily, IDLE comes with its own built-in text editor.<br />
<br />
To get started, go to the File menu of the Python Shell and click on "New Window". This should give you a blank document with the title "Untitled" as shown below:<br />
<br />
[[File:Idle2-6.png]]<br />
<br />
You'll need to save your file before running it, so you might as well save it now. Make sure that you name your file with a name that ends in .py, so that your computer knows it is a Python program. Here we save ours as test.py:<br />
<br />
[[File:Idle2-7.png]]<br />
<br />
To get acquainted with the text editor, let's write our first Python program! Let's write a program to the following task:<br />
<br />
'''Find the sum of all the positive multiples of 3 below 1000.'''<br />
<br />
We solve this by keeping a running total: we'll start with the smallest positive multiple of 3 and go up one multiple at a time keeping track of the sum, stopping once we hit 1000. We can do this with the following code:<br />
<br />
[[File:Idle2-8.png]]<br />
<br />
Notice that as you type the above code, the keywords ("while" and "print") will automatically get colored -- this makes the code easier to read. Also, after typing the line "while i < 1000:", the editor will automatically start indenting for you. When you get to the line "print(total)", you'll need to use the backspace key to remove the indentation. It is important that the code look exactly like it does in the screenshot above: in Python, proper indentation is very important!<br />
<br />
This program basically works by incrementing <math>\verb=i=</math> by 3 every time and adding it to the <math>\verb=total=</math>. The <math>\verb%+=%</math> notation might be intimidating at first. However, the statement <math>\verb%i+=3%</math> is just a shorthand for <math>\verb%i = i + 3%</math>.<br />
<br />
Now that we've written this code, we probably want to run it and test it out. We can do so by going to the Run menu and hitting Run Module (shortcut F5). The program should execute and print out the answer to the Python Shell:<br />
<br />
[[File:Idle2-9.png]]<br />
<br />
The RESTART line just means that Python is clearing all the work you've previously done before it starts running your program. Then, the program runs and we get our answer, 166833. If instead you get an error message or a different answer, check that your program exactly matches the screenshot above, and try it again.<br />
<br />
=What's Next?=<br />
<br />
Now that you've learned the very basics of getting Python going, there's a bunch of tutorials you can look at which are [http://wiki.python.org/moin/BeginnersGuide/NonProgrammers listed] on the Python website. Go check them out!<br />
<br />
Or, take our Introduction to Programming with Python online course!</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Moderators&diff=79280AoPS Moderators2016-07-12T23:48:20Z<p>Wlm2: /* List of Admins */</p>
<hr />
<div>A moderator on the Art of Problem Solving website is a non-administrator user who has powers for a particular forum which non-moderators don't. That is: they can lock topics in a forum, move them, delete them, comment about certain posts and so on. The short form for moderator is mod, the short term for administrator is admin.<br />
<br />
When a user is an Administrator, their name shows up in red.<br />
When they are a mod, their name shows up in green.<br />
<br />
==Moderators vs. Administrators==<br />
<br />
Administrators are more powerful in Art of Problem Solving than moderators. Moderators answer to Administrators, and not vice versa.<br />
<br />
Some admins might have their names in blue instead of red. Those are AoPS site administrators. They are administrators to all forums on AoPS, even private forums and class forums.<br />
<br />
==List of Admins ==<br />
<br />
Below is a list of some of the current AoPS admins:<br />
<br />
<br />
5space ??<br />
ahuhn (Anika Huhn)<br />
ak.santana (Anakaren Santana)<br />
amysz (Amy Szczepanski)<br />
corinne ??<br />
devenware (Deven Ware)<br />
DuncanG (Duncan Gilles)<br />
gmaas (Grayson Maas)<br />
jgf1123 ??<br />
LauraZed (Laura Zehender)<br />
levans (Larry Evans)<br />
paulhryu (Paul Ryu)<br />
phxu (Phyllis Xu)<br />
psalerno (Paul Salerno)<br />
srogers (Shannon Rogers)<br />
copeland (Jeremy Copeland)<br />
{{stub}}</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Moderators&diff=79279AoPS Moderators2016-07-12T23:46:43Z<p>Wlm2: /* List of Admins */</p>
<hr />
<div>A moderator on the Art of Problem Solving website is a non-administrator user who has powers for a particular forum which non-moderators don't. That is: they can lock topics in a forum, move them, delete them, comment about certain posts and so on. The short form for moderator is mod, the short term for administrator is admin.<br />
<br />
When a user is an Administrator, their name shows up in red.<br />
When they are a mod, their name shows up in green.<br />
<br />
==Moderators vs. Administrators==<br />
<br />
Administrators are more powerful in Art of Problem Solving than moderators. Moderators answer to Administrators, and not vice versa.<br />
<br />
Some admins might have their names in blue instead of red. Those are AoPS site administrators. They are administrators to all forums on AoPS, even private forums and class forums.<br />
<br />
==List of Admins ==<br />
<br />
Below is a list of some of the current AoPS admins:<br />
<br />
<br />
5space ??<br />
ahuhn (Anika Huhn)<br />
ak.santana (Anakaren Santana)<br />
amysz (Amy Szczepanski)<br />
corinne ??<br />
devenware (Deven Ware)<br />
DuncanG (Duncan Gilles)<br />
gmaas (Grayson Maas)<br />
jgf1123 ??<br />
LauraZed (Laura Zed)<br />
levans (Larry Evans)<br />
paulhryu (Paul Ryu)<br />
phxu (Phyllis Xu)<br />
psalerno (Paul Salerno)<br />
srogers (Shannon Rogers)<br />
copeland (Jeremy Copeland)<br />
{{stub}}</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Moderators&diff=79278AoPS Moderators2016-07-12T23:37:50Z<p>Wlm2: /* List of Admins */</p>
<hr />
<div>A moderator on the Art of Problem Solving website is a non-administrator user who has powers for a particular forum which non-moderators don't. That is: they can lock topics in a forum, move them, delete them, comment about certain posts and so on. The short form for moderator is mod, the short term for administrator is admin.<br />
<br />
When a user is an Administrator, their name shows up in red.<br />
When they are a mod, their name shows up in green.<br />
<br />
==Moderators vs. Administrators==<br />
<br />
Administrators are more powerful in Art of Problem Solving than moderators. Moderators answer to Administrators, and not vice versa.<br />
<br />
Some admins might have their names in blue instead of red. Those are AoPS site administrators. They are administrators to all forums on AoPS, even private forums and class forums.<br />
<br />
==List of Admins ==<br />
<br />
Below is a list of some of the current AoPS admins:<br />
<br />
<br />
5space<br />
ahuhn<br />
ak.santana<br />
amysz<br />
corinne<br />
devenware (Deven Ware)<br />
DuncanG (Duncan Gilles)<br />
gmaas<br />
jgf1123<br />
LauraZed (Laura Zed)<br />
levans (Larry Evans)<br />
paulhryu (Paul Ryu)<br />
phxu<br />
psalerno<br />
srogers<br />
copeland<br />
{{stub}}</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=Base_arithmetic&diff=79235Base arithmetic2016-07-08T15:19:34Z<p>Wlm2: /* Base Arithmetic */</p>
<hr />
<div>Overall, base arithmetic is<br />
==Base Addition==<br />
==Base Subtraction==<br />
==Base Multiplication==<br />
==Base Division==</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=Base_arithmetic&diff=79234Base arithmetic2016-07-08T15:18:46Z<p>Wlm2: Created page with "=Base Arithmetic= ==Base Addition== ==Base Subtraction== ==Base Multiplication== ==Base Division=="</p>
<hr />
<div>=Base Arithmetic=<br />
==Base Addition==<br />
==Base Subtraction==<br />
==Base Multiplication==<br />
==Base Division==</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=Divisor&diff=79233Divisor2016-07-08T15:06:59Z<p>Wlm2: /* Notation */</p>
<hr />
<div>A [[natural number]] <math>{d}</math> is called a '''divisor''' of a natural number <math>{n}</math> if there is a natural number <math>{k}</math> such that <math>n=kd</math> or, in other words, if <math>\frac nd</math> is also a natural number (i.e <math>d</math> divides <math>n</math>). See [[Divisibility]] for more information.<br />
<br />
== Notation==<br />
A common notation to indicate a number is a divisor of another is <math>n|k</math>. This means that <math>n</math> divides <math>k</math>.<br />
<br />
<br />
See the main article on [[counting divisors]]. If <math>n=p_{1}^{\alpha_{1}} \cdot p_{2}^{\alpha_{2}}\cdot\dots\cdot p_m^{\alpha_m}</math> is the [[prime factorization]] of <math>{n}</math>, then the number <math>d(n)</math> of different divisors of <math>n</math> is given by the formula <math>d(n)=(\alpha_{1} + 1)\cdot(\alpha_{2} + 1)\cdot\dots\cdot(\alpha_{m} + 1)</math>. It is often useful to know that this expression grows slower than any positive power of <math>{n}</math> as <math>n\to\infty</math>. <br />
We also know that the product of the divisors of any integer <math>n</math> is <cmath>n^{\frac{t(n)}{2}}</cmath>.<br />
Another useful idea is that <math>d(n)</math> is [[odd integer | odd]] if and only if <math>{n}</math> is a [[perfect square]].<br />
<br />
==Useful formulas==<br />
* If <math>{m}</math> and <math>{n}</math> are [[relatively prime]], then <math>d(mn)=d(m)d(n)</math><br />
* <math>{\sum_{n=1}^N d(n)=\left\lfloor\frac N1\right\rfloor+\left\lfloor\frac N2\right\rfloor+\dots+\left\lfloor\frac NN\right\rfloor= N\ln N+O(N)}</math><br />
<br />
==See also==<br />
* [[Divisor function]]<br />
* [[Number theory]]<br />
* [[GCD]]<br />
* [[Divisibility]]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=Divisor&diff=79232Divisor2016-07-08T15:06:06Z<p>Wlm2: /* Notation */</p>
<hr />
<div>A [[natural number]] <math>{d}</math> is called a '''divisor''' of a natural number <math>{n}</math> if there is a natural number <math>{k}</math> such that <math>n=kd</math> or, in other words, if <math>\frac nd</math> is also a natural number (i.e <math>d</math> divides <math>n</math>). See [[Divisibility]] for more information.<br />
<br />
== Notation==<br />
A common notation to indicate a number is a divisor of another is <math>n|k</math>. This means that <math>n</math> divides <math>k</math>.<br />
<br />
<br />
See the main article on [[counting divisors]]. If <math>n=p_{1}^{\alpha_{1}} \cdot p_{2}^{\alpha_{2}}\cdot\dots\cdot p_m^{\alpha_m}</math> is the [[prime factorization]] of <math>{n}</math>, then the number <math>d(n)</math> of different divisors of <math>n</math> is given by the formula <math>d(n)=(\alpha_{1} + 1)\cdot(\alpha_{2} + 1)\cdot\dots\cdot(\alpha_{m} + 1)</math>. It is often useful to know that this expression grows slower than any positive power of <math>{n}</math> as <math>n\to\infty</math>. <br />
We can also count the product of divisors of any integer <math>n</math> with this formula: <cmath>n^{\frac{t(n)}{2}}</cmath><br />
Another useful idea is that <math>d(n)</math> is [[odd integer | odd]] if and only if <math>{n}</math> is a [[perfect square]].<br />
<br />
==Useful formulas==<br />
* If <math>{m}</math> and <math>{n}</math> are [[relatively prime]], then <math>d(mn)=d(m)d(n)</math><br />
* <math>{\sum_{n=1}^N d(n)=\left\lfloor\frac N1\right\rfloor+\left\lfloor\frac N2\right\rfloor+\dots+\left\lfloor\frac NN\right\rfloor= N\ln N+O(N)}</math><br />
<br />
==See also==<br />
* [[Divisor function]]<br />
* [[Number theory]]<br />
* [[GCD]]<br />
* [[Divisibility]]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=Art_of_Problem_Solving&diff=79219Art of Problem Solving2016-07-07T22:04:58Z<p>Wlm2: /* Mission */</p>
<hr />
<div>'''Art of Problem Solving''' ('''AoPS''') is an educational resources company founded by [[Richard Rusczyk]] in 2003. <br />
<br />
<br />
== The company ==<br />
=== Staff ===<br />
Members of the AoPS staff include [[Larry Evans]], [[Richard Rusczyk]], [[David Patrick]], [[Valentin Vornicu]], [[Naoki Sato]], [[Vanessa Rusczyk]], and dozens of college students whose part time efforts help make the AoPS community what it is.<br />
<br />
=== Mission ===<br />
The main goal of AoPS is to create interactive educational opportunities for avid students of [[mathematics]]. As time goes on, AoPS is reaching out to students of other [[problem solving]] disciplines as well, including [[informatics]], [[physics]], programming, and others.<br />
<br />
=== Tradition of Excellence ===<br />
The accomplishments of every student are unique, and there is no way to measure that success. However, we try to record and celebrate [[AoPS Community Awards | achievements of AoPS students, faculty, and community members]].<br />
<br />
== Resources on AoPS ==<br />
=== AoPSWiki ===<br />
You're in the [[AoPSWiki]] now!<br />
<br />
* [[AoPSWiki:Table of Contents]] -- a basic guide to AoPSWiki content<br />
* [[Academic competitions]] including a huge [[List of mathematics competitions]]<br />
* [[Math books]]<br />
* [[Academic scholarships]] including a large list of [[Mathematics scholarships]]<br />
<br />
=== AoPS Books ===<br />
<br />
==== Subject textbooks ====<br />
AoPS subject texts provide instruction to excellent students of mathematics. This modern curriculum is both comprehensive and challenging enough for brilliant young mathematical minds.<br />
* [http://www.artofproblemsolving.com/Books/AoPS_B_Item.php?item_id=200 Introduction to Algebra]<br />
* [http://www.artofproblemsolving.com/Books/AoPS_B_Item.php?item_id=202 Introduction to Counting & Probability]<br />
* [http://www.artofproblemsolving.com/Books/AoPS_B_Item.php?item_id=204 Introduction to Geometry]<br />
* [http://www.artofproblemsolving.com/Books/AoPS_B_Item.php?item_id=206 Introduction to Number Theory]<br />
* [http://www.artofproblemsolving.com/Store/viewitem.php?item=interm:algebra Intermediate Algebra]<br />
* [http://www.artofproblemsolving.com/Books/AoPS_B_Item.php?item_id=302 Intermediate Counting & Probability]<br />
* [http://www.artofproblemsolving.com/Store/viewitem.php?item=precalc Precalculus]<br />
* [http://www.artofproblemsolving.com/Store/viewitem.php?item=calculus Calculus]<br />
<br />
==== Problem solving books ====<br />
The original Art of Problem Solving books cover a variety of topics of interest to top students of mathematics.<br />
* [http://www.artofproblemsolving.com/Books/AoPS_B_Item.php?page_id=1 Art of Problem Solving Volume 1]<br />
* [http://www.artofproblemsolving.com/Books/AoPS_B_Item.php?page_id=2 Art of Problem Solving Volume 2]<br />
<br />
==== Other math books ====<br />
AoPS sells numerous other math books at the [http://www.artofproblemsolving.com/Books/AoPS_B_About.php AoPS Bookstore]. Many of these books focus on competitions such as the [[AMC]], the [[Mandelbrot Competition]], [[Mathcounts]], or [[MOEMS]].<br />
<br />
=== AoPS Online School ===<br />
The [[AoPS Online School]] hosts math classes primarily for bright middle and high school students. Students of the online math school include winners of nearly every major mathematics competition in the U.S.<br />
<br />
<br />
=== AoPS Forums ===<br />
The [http://www.artofproblemsolving.com/Forum/index.php AoPS Forums] are a place where students and problem solvers of all ages can discuss mathematics and problem solving. Visit [[AoPSWiki:AoPS forums]] for more details.<br />
<br />
=== AoPS For The Win ===<br />
[http://www.artofproblemsolving.com/Edutainment/g1/index.php For The Win] is an online interactive game for students to participate in activities similar to Countdown Round in MathCounts.<br />
<br />
=== TeX/LaTeX Resources ===<br />
The <url>index.php AoPS Forums</url> are [[LaTeX]]-enabled, allowing users to post nice mathematics.<br />
<br />
=== Math contest problem database ===<br />
<br />
AoPS members help organize a large and well-organized <url>resources.php list of problems and solutions</url> from [[mathematics competitions]] all over the world.<br />
<br />
=== Articles ===<br />
<br />
AoPS resources include [http://artofproblemsolving.com/articles numerous articles] for students, parents, and teachers.<br />
<br />
== Philanthropy ==<br />
Many of the features of the Art of Problem Solving website are made available for free so that every student interested in mathematics can use them.<br />
<br />
Additionally, AoPS instructors provide hundreds of hours of teaching and support time for the [[San Diego Math Circle]].<br />
<br />
The [[Art of Problem Solving Foundation]] is a nonprofit corporation founded by AoPS CEO [[Richard Rusczyk]] with largely the same fundamental mission as AoPS itself, but with greater focus on providing educational resources where they are lacking. AoPS donates a portion of its book and class sales to the foundation. A link can be found [http://www.artofproblemsolving.org here]. Make sure it is .org if you want to see the foundation website, otherwise, you'll see the homepage of the current website you're on. <br />
<br />
<br />
<br />
[[Category:Art of Problem Solving]]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Wiki:FAQ&diff=79218AoPS Wiki:FAQ2016-07-07T22:00:26Z<p>Wlm2: /* Can I change my user name? */</p>
<hr />
<div>{{shortcut|[[A:FAQ]]}}<br />
<br />
This is a community created list of Frequently Asked Questions about Art of Problem Solving. If you have a request to edit or add a question on this page, please make it [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=416&t=414129 here].<br />
<br />
== General==<br />
<br />
<br />
==== Can I change my user name? ====<br />
<br />
:As indicated during the time of your registration, you are unable to change your username. However, if you have a strong reason for doing so or if your username contains your real name, you can PM an admin and they will decide if your reason is worthy of having a username change.<br />
<br />
==== Can I make more than one account? ====<br />
<br />
:It is preferred that you have one and only one account. Having more leads to issues of not remembering on what account you did what. Using multiple accounts to "game" the system, (e.g., increase rating for posts or in online games) will lead to bans on all accounts associated to you. If you have already made additional accounts, please choose one account and stop using the others.<br />
<br />
====What software does Art of Problem Solving use to run the website?====<br />
<br />
:* Search: Solr<br />
:* Wiki: MediaWiki<br />
:* Asymptote and Latex are generated through their respective binary packages<br />
:* Videos: YouTube<br />
<br />
All other parts of the website are custom built.<br />
<br />
<br />
====Can you make an AoPS App?====<br />
<br />
:There are currently no plans to build an app. Any app built would work almost identically to the website, and not be any faster, so there is little value in building an app.<br />
<br />
== Forums ==<br />
<br />
==== How do I format my post, e.g. bold text, add URLs, etc.? ====<br />
<br />
:AoPS is based on a markup language called BBCode. A tutorial of its functions on AoPS and how to use them can be found [[BBCode:Tutorial|here]].<br />
<br />
==== How do I hide content in the forums? ====<br />
:Wrap the content you want to hide in [hide] tags.<br />
[hide]Content[/hide]<br />
:If you want to customize the label, instead of saying "Click here to reveal hidden text", you can do something like:<br />
[hide=Label to display]Content[/hide]<br />
<br />
==== I got the message "You can not post at this time" when trying to post, why? ====<br />
<br />
:New users are not allowed to post messages with URLs and various other things. Once you have five posts you can post normally.<br />
<br />
====I got the message "Too many messages." when trying to send a private message, why?====<br />
:To prevent PM spam abuse, users with less than five forum posts are limited to four private messages within a forty-eight hour period.<br />
<br />
==== If I make more posts, it means I'm a better user, right? ====<br />
<br />
:Absolutely not. Post quality is far more important than post quantity. Users making a lot of senseless posts are often considered worse users, or spammers.<br />
<br />
==== I have made some posts but my post count did not increase. Why? ====<br />
<br />
:When you post in some of the forums, such as the Test Forum, Mafia Forum, and the Fun Factory, it does not count towards your post count.<br />
<br />
==== How does AoPS select moderators? ====<br />
<br />
:When a new moderator is needed in the forums, AoPS administrators first check if any current moderators could serve as a moderator of the forum which needs a moderator. Should none be found, AoPS administrators and/or other moderators scour the forum looking for productive users. They may also ask for suggestions from other moderators or trusted users on the site. Once they have pinpointed a possible candidate based on their long term usage of the site, productive posts in the forum, and having no recent behavioral issues, that user is asked if he or she would like to moderate the forum. <br />
<br />
:Less active forums often have no moderator. Inappropriate posts should be reported by users and administrators will take appropriate action.<br />
<br />
:AoPS receives MANY requests to be a moderator. As they receive so many, it is possible that you won't get a response should you request to be one. Also, AoPS very rarely makes someone a mod for asking to be one, so '''please do not ask'''.<br />
<br />
==== I believe a post needs corrective action. What should I do? ====<br />
<br />
:If you believe a post needs moderative action, you may report it by clicking the "!" icon on the upper-right corner of that post. If it's a minor mistake, you may want to PM the offending user instead and explain how they can make their post better. Usually, you shouldn't publicly post such things on a thread itself, which is called "backseat moderation" and is considered rude.<br />
<br />
==== How long of a non-commented thread is considered reviving? ====<br />
<br />
:If any post is still on-topic and isn't spammy, it isn't considered reviving. However, everyone has a different period of time that they consider reviving. In general, apply common sense.<br />
<br />
==== Someone is marking all my posts as spam, what should I do? ====<br />
<br />
:It happens to everyone. There's really not much you can do.<br />
<br />
==== Are posts marked spam more often better than good? ====<br />
<br />
:No.<br />
<br />
==== How do I post images? ====<br />
<br />
:While AoPS forums have the ability to attach images, we do not generally recommend doing so, as we can not guarantee the images will be available through upgrades, restorations, etc. We also have limited disk space which causes us to remove attachments from time to time. Therefore, we recommend using a third party image hosting solution. There are many options, but we recommend imgur.com.<br />
<br />
:* Go to imgur.com<br />
:* Click upload images<br />
:* Follow the on screen instructions to upload the image to imgur.<br />
:* After uploading, you'll be presented the uploaded image along with links on the left.<br />
:* Find the link labeled BBCode (message boards & forums)<br />
:* Copy the code, and paste into your post. It will look something like:<br />
<br />
[img]http://i.imgur.com/aBcDeFgH.jpg[/img]<br />
<br />
== Blogs ==<br />
==== How come I can't create a blog? ====<br />
:One needs to have at least 5 posts in order to make a blog.<br />
==== How do I make my blog look nice? ====<br />
:Many AoPSers make their blogs look awesome by applying [[CSS|CSS]], which is a high-level stylesheet language. This can be done by typing CSS code into the CSS box in the Blog Control Panel.<br />
<br />
== Contests ==<br />
==== Where can I find past contest questions and solutions? ====<br />
:In the [http://www.artofproblemsolving.com/Forum/resources.php Contests] section.<br />
<br />
==== How do I get problems onto the contest page? ====<br />
<br />
:Make a topic for each question in the appropriate forum, copy/paste the urls to the National Olympiad. Your problems may eventually be submitted into the Contest page.<br />
<br />
==== Who can I ask to add posts to the contests section? ====<br />
:Any one of the members in the the [http://www.artofproblemsolving.com/Forum/memberlist.php?mode=group&g=417 RManagers] group.<br />
<br />
==== What are the guidelines for posting problems to be added to the contests section? ====<br />
:Refer to the [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=144&t=195579 guidelines in this post].<br />
<br />
==== Why is the wiki missing many contest questions? ====<br />
:Generally, it is because users have not yet posted them onto the wiki (translation difficulties, not having access to the actual problems, lack of interest, etc). If you have a copy, please post the problems in the Community Section! In some cases, however, problems may be missing due to copyright claims from maths organizations. See, for example, [http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1391106#p1391106 this post].<br />
<br />
==== What if I find an error on a problem? ====<br />
Please post an accurate description of the problem in [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=133&t=426693 this thread]<br />
<br />
== LaTeX and Asymptote ==<br />
==== What is LaTeX, and how do I use it? ====<br />
<br />
:<math>\LaTeX</math> is a typesetting markup language that is useful to produce properly formatted mathematical and scientific expressions.<br />
<br />
==== How can I download LaTeX to use on the forums? ====<br />
<br />
:There are no downloads necessary; the forums and the wiki render LaTeX commands between dollar signs. <br />
<br />
==== How can I download LaTeX for personal use? ====<br />
:You can download TeXstudio [http://texstudio.sourceforge.net here] or TeXnicCenter [http://www.texniccenter.org here]<br />
<br />
==== Where can I find a list of LaTeX commands? ====<br />
:See [[LaTeX:Symbols|here]].<br />
<br />
==== Where can I test LaTeX commands? ====<br />
<br />
:[[A:SAND|Sandbox]] or [http://www.artofproblemsolving.com/Resources/texer.php TeXeR]. You can also use our [http://artofproblemsolving.com/community/c67_test_forum Test Forum].<br />
<br />
==== Where can I find examples of Asymptote diagrams and code? ====<br />
<br />
:Search this wiki for the <tt><nowiki><asy></nowiki></tt> tag or the Forums for the <tt><nowiki>[asy]</nowiki></tt> tag. See also [[Asymptote:_Useful_commands_and_their_Output|these examples]] and [[Proofs without words|this article]] (click on the images to obtain the code).<br />
<br />
==== How can I draw 3D diagrams? ====<br />
<br />
:See [[Asymptote: 3D graphics]].<br />
<br />
==== What is the cse5 package? ==== <br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=149650 here]. The package contains a set of shorthand commands that implement the behavior of usual commands, for example <tt>D()</tt> for <tt>draw()</tt> and <tt>dot()</tt>, and so forth.<br />
<br />
==== What is the olympiad package? ====<br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=165767 here]. The package contains a set of commands useful for drawing diagrams related to [[:Category:Olympiad Geometry Problems|olympiad geometry problems]].<br />
<br />
== AoPSWiki ==<br />
==== Is there a guide for wiki syntax? ====<br />
<br />
:See [http://en.wikipedia.org/wiki/Help:Wiki_markup wiki markup], [[AoPSWiki:Tutorial]], and [[Help:Contents]].<br />
<br />
==== What do I do if I see a mistake in the wiki? ====<br />
<br />
:Edit the page and correct the error! You can edit most pages on the wiki. Click the "edit" button on the right sidebar to edit a page.<br />
<br />
==== Why can't I edit the wiki? ====<br />
<br />
You must be a registered user on Aops to edit. To be registered, make sure you give a correct email, and activate your account.<br />
<br />
== Miscellaneous ==<br />
==== Is it possible to join the AoPS Staff? ====<br />
<br />
:Yes. Mr. Rusczyk will sometimes hire a small army of college students to work as interns, graders, and teaching assistants. You must be at least in your second semester of your senior year and be legal to work in the U.S. (at least 16).<br />
<br />
==== What is the minimum age to be an assistant in an Art of Problem Solving class? ====<br />
<br />
:You must have graduated from high school, or at least be in the second term of your senior year.<br />
<br />
==AoPS Acronyms==<br />
*'''AFK'''- Away from keyboard<br />
*'''AoPS'''- Art of Problem Solving, the website you're on right now!<br />
*'''AIME'''- American Invitational Mathematics Examination<br />
*'''AMC'''- American Math Competitions<br />
*'''ATM'''- At the Moment<br />
*'''brb'''- Be right Back<br />
*'''BTW'''- By the way<br />
*'''CEMC''' - Centre for Mathematics and Computing<br />
*'''C&P or C+P''' - Counting and Probability or Contests and Programs<br />
*'''EBWOP'''- Editing by way of post<br />
*'''FTW'''- For the Win, a game on AoPS<br />
*'''gg'''- Good Game<br />
*'''gj'''- Good Job<br />
*'''glhf'''-Good Luck Have Fun<br />
*'''gtg''' - Got to go<br />
*'''ID(R)K'''-I Don't (Really) Know<br />
*'''iff'''-If and only if<br />
*'''IIRC'''- If I recall correctly<br />
*'''IMO'''- In my opinion (or International Math Olympiad, depending on context)<br />
*'''JMO'''- United States of America Junior Mathematical Olympiad<br />
*'''lol'''- Laugh Out Loud<br />
*'''MC'''- Mathcounts, a popular math contest for Middle School students.<br />
*'''MOP'''- Mathematical Olympiad (Summer) Program<br />
*'''MSM'''- Middle School Math<br />
*'''NT'''- Number Theory<br />
*'''OBC'''- Online by computer<br />
*'''OMG'''- Oh My Gosh.<br />
*'''OP'''- Original Poster/Original Post/Original Problem, or Overpowered/Overpowering<br />
*'''QED'''- Quod erat demonstrandum, Latin for Which was to be proven; some English mathematicians use it as an acronym for Quite Elegantly Done<br />
*'''QS&A'''- Questions, Suggestions, and Announcements Forum<br />
*'''ro(t)fl''' - Rolling on the floor laughing<br />
*'''sa''' - sa<br />
*'''smh''' - Shaking my head<br />
*'''USA(J)MO'''- USA (Junior) Mathematical Olympiad<br />
*'''V/LA'''- Vacation or Long Absence/Limited Access<br />
*'''WLOG'''- Without loss of generality<br />
*'''wrt'''- With respect to<br />
*'''wtg''' - Way to go<br />
*'''tytia'''- Thank you, that is all<br />
*'''xD'''- Bursting Laugh<br />
<br />
== FTW! ==<br />
<br />
==== How do I access FTW? ====<br />
You can access FTW by clicking For the Win! from the Resources drop-down menu at the top of the page.<br />
<br />
==== Did FTW miscount my number of games?====<br />
<br />
No! However, the (Overall) rating statistics do not count games with less than 6 problems or less than 15 seconds.<br />
<br />
For example, if you have played 30 games, but not all of them were 6 problems or higher, then you will still be muted.<br />
<br />
== School ==<br />
<br />
==== What if I want to drop out of a class? ====<br />
:For any course with more than 2 classes, students can drop the course any time before the third class begins and receive a full refund. No drops are allowed after the third class has started. To drop the class, go to the My Classes section by clicking the My Classes link at the top-right of the website. Then find the area on the right side of the page that lets you drop the class. A refund will be processed within 10 business days.<br />
<br />
==== What if I miss a class? ====<br />
:There are classroom transcripts available under My Classes, available at the top right of the web site. You can view these transcripts in order to review any missed material. You can also ask questions on the class message board. Don't worry, though, classroom participation usually isn't weighted heavily.<br />
<br />
==== Is there audio or video in class? ====<br />
:There is generally no audio or video in the class. The classes are generally completely text based, in an interactive chat room environment, which allows students to ask questions at any time during the class. In addition to audio and video limiting interactivity, the technology isn't quite there yet for all students to be able to adequately receive streaming audio and video.<br />
<br />
====I feel like joining! What are my class choices? ====<br />
:[http://www.artofproblemsolving.com/School/classlist.php Class List] [http://www.artofproblemsolving.com/School/index.php?page=school.instructors Instructors List]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Wiki:FAQ&diff=79217AoPS Wiki:FAQ2016-07-07T21:54:41Z<p>Wlm2: /* How long of a non-commented thread is considered reviving? */</p>
<hr />
<div>{{shortcut|[[A:FAQ]]}}<br />
<br />
This is a community created list of Frequently Asked Questions about Art of Problem Solving. If you have a request to edit or add a question on this page, please make it [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=416&t=414129 here].<br />
<br />
== General==<br />
<br />
<br />
==== Can I change my user name? ====<br />
<br />
:As indicated during the time of your registration, you are unable to change your username. However, if you have a strong reason for doing so, you can PM an admin and they will decide if your reason is worthy of having a username change.<br />
<br />
==== Can I make more than one account? ====<br />
<br />
:It is preferred that you have one and only one account. Having more leads to issues of not remembering on what account you did what. Using multiple accounts to "game" the system, (e.g., increase rating for posts or in online games) will lead to bans on all accounts associated to you. If you have already made additional accounts, please choose one account and stop using the others.<br />
<br />
====What software does Art of Problem Solving use to run the website?====<br />
<br />
:* Search: Solr<br />
:* Wiki: MediaWiki<br />
:* Asymptote and Latex are generated through their respective binary packages<br />
:* Videos: YouTube<br />
<br />
All other parts of the website are custom built.<br />
<br />
<br />
====Can you make an AoPS App?====<br />
<br />
:There are currently no plans to build an app. Any app built would work almost identically to the website, and not be any faster, so there is little value in building an app.<br />
<br />
== Forums ==<br />
<br />
==== How do I format my post, e.g. bold text, add URLs, etc.? ====<br />
<br />
:AoPS is based on a markup language called BBCode. A tutorial of its functions on AoPS and how to use them can be found [[BBCode:Tutorial|here]].<br />
<br />
==== How do I hide content in the forums? ====<br />
:Wrap the content you want to hide in [hide] tags.<br />
[hide]Content[/hide]<br />
:If you want to customize the label, instead of saying "Click here to reveal hidden text", you can do something like:<br />
[hide=Label to display]Content[/hide]<br />
<br />
==== I got the message "You can not post at this time" when trying to post, why? ====<br />
<br />
:New users are not allowed to post messages with URLs and various other things. Once you have five posts you can post normally.<br />
<br />
====I got the message "Too many messages." when trying to send a private message, why?====<br />
:To prevent PM spam abuse, users with less than five forum posts are limited to four private messages within a forty-eight hour period.<br />
<br />
==== If I make more posts, it means I'm a better user, right? ====<br />
<br />
:Absolutely not. Post quality is far more important than post quantity. Users making a lot of senseless posts are often considered worse users, or spammers.<br />
<br />
==== I have made some posts but my post count did not increase. Why? ====<br />
<br />
:When you post in some of the forums, such as the Test Forum, Mafia Forum, and the Fun Factory, it does not count towards your post count.<br />
<br />
==== How does AoPS select moderators? ====<br />
<br />
:When a new moderator is needed in the forums, AoPS administrators first check if any current moderators could serve as a moderator of the forum which needs a moderator. Should none be found, AoPS administrators and/or other moderators scour the forum looking for productive users. They may also ask for suggestions from other moderators or trusted users on the site. Once they have pinpointed a possible candidate based on their long term usage of the site, productive posts in the forum, and having no recent behavioral issues, that user is asked if he or she would like to moderate the forum. <br />
<br />
:Less active forums often have no moderator. Inappropriate posts should be reported by users and administrators will take appropriate action.<br />
<br />
:AoPS receives MANY requests to be a moderator. As they receive so many, it is possible that you won't get a response should you request to be one. Also, AoPS very rarely makes someone a mod for asking to be one, so '''please do not ask'''.<br />
<br />
==== I believe a post needs corrective action. What should I do? ====<br />
<br />
:If you believe a post needs moderative action, you may report it by clicking the "!" icon on the upper-right corner of that post. If it's a minor mistake, you may want to PM the offending user instead and explain how they can make their post better. Usually, you shouldn't publicly post such things on a thread itself, which is called "backseat moderation" and is considered rude.<br />
<br />
==== How long of a non-commented thread is considered reviving? ====<br />
<br />
:If any post is still on-topic and isn't spammy, it isn't considered reviving. However, everyone has a different period of time that they consider reviving. In general, apply common sense.<br />
<br />
==== Someone is marking all my posts as spam, what should I do? ====<br />
<br />
:It happens to everyone. There's really not much you can do.<br />
<br />
==== Are posts marked spam more often better than good? ====<br />
<br />
:No.<br />
<br />
==== How do I post images? ====<br />
<br />
:While AoPS forums have the ability to attach images, we do not generally recommend doing so, as we can not guarantee the images will be available through upgrades, restorations, etc. We also have limited disk space which causes us to remove attachments from time to time. Therefore, we recommend using a third party image hosting solution. There are many options, but we recommend imgur.com.<br />
<br />
:* Go to imgur.com<br />
:* Click upload images<br />
:* Follow the on screen instructions to upload the image to imgur.<br />
:* After uploading, you'll be presented the uploaded image along with links on the left.<br />
:* Find the link labeled BBCode (message boards & forums)<br />
:* Copy the code, and paste into your post. It will look something like:<br />
<br />
[img]http://i.imgur.com/aBcDeFgH.jpg[/img]<br />
<br />
== Blogs ==<br />
==== How come I can't create a blog? ====<br />
:One needs to have at least 5 posts in order to make a blog.<br />
==== How do I make my blog look nice? ====<br />
:Many AoPSers make their blogs look awesome by applying [[CSS|CSS]], which is a high-level stylesheet language. This can be done by typing CSS code into the CSS box in the Blog Control Panel.<br />
<br />
== Contests ==<br />
==== Where can I find past contest questions and solutions? ====<br />
:In the [http://www.artofproblemsolving.com/Forum/resources.php Contests] section.<br />
<br />
==== How do I get problems onto the contest page? ====<br />
<br />
:Make a topic for each question in the appropriate forum, copy/paste the urls to the National Olympiad. Your problems may eventually be submitted into the Contest page.<br />
<br />
==== Who can I ask to add posts to the contests section? ====<br />
:Any one of the members in the the [http://www.artofproblemsolving.com/Forum/memberlist.php?mode=group&g=417 RManagers] group.<br />
<br />
==== What are the guidelines for posting problems to be added to the contests section? ====<br />
:Refer to the [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=144&t=195579 guidelines in this post].<br />
<br />
==== Why is the wiki missing many contest questions? ====<br />
:Generally, it is because users have not yet posted them onto the wiki (translation difficulties, not having access to the actual problems, lack of interest, etc). If you have a copy, please post the problems in the Community Section! In some cases, however, problems may be missing due to copyright claims from maths organizations. See, for example, [http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1391106#p1391106 this post].<br />
<br />
==== What if I find an error on a problem? ====<br />
Please post an accurate description of the problem in [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=133&t=426693 this thread]<br />
<br />
== LaTeX and Asymptote ==<br />
==== What is LaTeX, and how do I use it? ====<br />
<br />
:<math>\LaTeX</math> is a typesetting markup language that is useful to produce properly formatted mathematical and scientific expressions.<br />
<br />
==== How can I download LaTeX to use on the forums? ====<br />
<br />
:There are no downloads necessary; the forums and the wiki render LaTeX commands between dollar signs. <br />
<br />
==== How can I download LaTeX for personal use? ====<br />
:You can download TeXstudio [http://texstudio.sourceforge.net here] or TeXnicCenter [http://www.texniccenter.org here]<br />
<br />
==== Where can I find a list of LaTeX commands? ====<br />
:See [[LaTeX:Symbols|here]].<br />
<br />
==== Where can I test LaTeX commands? ====<br />
<br />
:[[A:SAND|Sandbox]] or [http://www.artofproblemsolving.com/Resources/texer.php TeXeR]. You can also use our [http://artofproblemsolving.com/community/c67_test_forum Test Forum].<br />
<br />
==== Where can I find examples of Asymptote diagrams and code? ====<br />
<br />
:Search this wiki for the <tt><nowiki><asy></nowiki></tt> tag or the Forums for the <tt><nowiki>[asy]</nowiki></tt> tag. See also [[Asymptote:_Useful_commands_and_their_Output|these examples]] and [[Proofs without words|this article]] (click on the images to obtain the code).<br />
<br />
==== How can I draw 3D diagrams? ====<br />
<br />
:See [[Asymptote: 3D graphics]].<br />
<br />
==== What is the cse5 package? ==== <br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=149650 here]. The package contains a set of shorthand commands that implement the behavior of usual commands, for example <tt>D()</tt> for <tt>draw()</tt> and <tt>dot()</tt>, and so forth.<br />
<br />
==== What is the olympiad package? ====<br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=165767 here]. The package contains a set of commands useful for drawing diagrams related to [[:Category:Olympiad Geometry Problems|olympiad geometry problems]].<br />
<br />
== AoPSWiki ==<br />
==== Is there a guide for wiki syntax? ====<br />
<br />
:See [http://en.wikipedia.org/wiki/Help:Wiki_markup wiki markup], [[AoPSWiki:Tutorial]], and [[Help:Contents]].<br />
<br />
==== What do I do if I see a mistake in the wiki? ====<br />
<br />
:Edit the page and correct the error! You can edit most pages on the wiki. Click the "edit" button on the right sidebar to edit a page.<br />
<br />
==== Why can't I edit the wiki? ====<br />
<br />
You must be a registered user on Aops to edit. To be registered, make sure you give a correct email, and activate your account.<br />
<br />
== Miscellaneous ==<br />
==== Is it possible to join the AoPS Staff? ====<br />
<br />
:Yes. Mr. Rusczyk will sometimes hire a small army of college students to work as interns, graders, and teaching assistants. You must be at least in your second semester of your senior year and be legal to work in the U.S. (at least 16).<br />
<br />
==== What is the minimum age to be an assistant in an Art of Problem Solving class? ====<br />
<br />
:You must have graduated from high school, or at least be in the second term of your senior year.<br />
<br />
==AoPS Acronyms==<br />
*'''AFK'''- Away from keyboard<br />
*'''AoPS'''- Art of Problem Solving, the website you're on right now!<br />
*'''AIME'''- American Invitational Mathematics Examination<br />
*'''AMC'''- American Math Competitions<br />
*'''ATM'''- At the Moment<br />
*'''brb'''- Be right Back<br />
*'''BTW'''- By the way<br />
*'''CEMC''' - Centre for Mathematics and Computing<br />
*'''C&P or C+P''' - Counting and Probability or Contests and Programs<br />
*'''EBWOP'''- Editing by way of post<br />
*'''FTW'''- For the Win, a game on AoPS<br />
*'''gg'''- Good Game<br />
*'''gj'''- Good Job<br />
*'''glhf'''-Good Luck Have Fun<br />
*'''gtg''' - Got to go<br />
*'''ID(R)K'''-I Don't (Really) Know<br />
*'''iff'''-If and only if<br />
*'''IIRC'''- If I recall correctly<br />
*'''IMO'''- In my opinion (or International Math Olympiad, depending on context)<br />
*'''JMO'''- United States of America Junior Mathematical Olympiad<br />
*'''lol'''- Laugh Out Loud<br />
*'''MC'''- Mathcounts, a popular math contest for Middle School students.<br />
*'''MOP'''- Mathematical Olympiad (Summer) Program<br />
*'''MSM'''- Middle School Math<br />
*'''NT'''- Number Theory<br />
*'''OBC'''- Online by computer<br />
*'''OMG'''- Oh My Gosh.<br />
*'''OP'''- Original Poster/Original Post/Original Problem, or Overpowered/Overpowering<br />
*'''QED'''- Quod erat demonstrandum, Latin for Which was to be proven; some English mathematicians use it as an acronym for Quite Elegantly Done<br />
*'''QS&A'''- Questions, Suggestions, and Announcements Forum<br />
*'''ro(t)fl''' - Rolling on the floor laughing<br />
*'''sa''' - sa<br />
*'''smh''' - Shaking my head<br />
*'''USA(J)MO'''- USA (Junior) Mathematical Olympiad<br />
*'''V/LA'''- Vacation or Long Absence/Limited Access<br />
*'''WLOG'''- Without loss of generality<br />
*'''wrt'''- With respect to<br />
*'''wtg''' - Way to go<br />
*'''tytia'''- Thank you, that is all<br />
*'''xD'''- Bursting Laugh<br />
<br />
== FTW! ==<br />
<br />
==== How do I access FTW? ====<br />
You can access FTW by clicking For the Win! from the Resources drop-down menu at the top of the page.<br />
<br />
==== Did FTW miscount my number of games?====<br />
<br />
No! However, the (Overall) rating statistics do not count games with less than 6 problems or less than 15 seconds.<br />
<br />
For example, if you have played 30 games, but not all of them were 6 problems or higher, then you will still be muted.<br />
<br />
== School ==<br />
<br />
==== What if I want to drop out of a class? ====<br />
:For any course with more than 2 classes, students can drop the course any time before the third class begins and receive a full refund. No drops are allowed after the third class has started. To drop the class, go to the My Classes section by clicking the My Classes link at the top-right of the website. Then find the area on the right side of the page that lets you drop the class. A refund will be processed within 10 business days.<br />
<br />
==== What if I miss a class? ====<br />
:There are classroom transcripts available under My Classes, available at the top right of the web site. You can view these transcripts in order to review any missed material. You can also ask questions on the class message board. Don't worry, though, classroom participation usually isn't weighted heavily.<br />
<br />
==== Is there audio or video in class? ====<br />
:There is generally no audio or video in the class. The classes are generally completely text based, in an interactive chat room environment, which allows students to ask questions at any time during the class. In addition to audio and video limiting interactivity, the technology isn't quite there yet for all students to be able to adequately receive streaming audio and video.<br />
<br />
====I feel like joining! What are my class choices? ====<br />
:[http://www.artofproblemsolving.com/School/classlist.php Class List] [http://www.artofproblemsolving.com/School/index.php?page=school.instructors Instructors List]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Wiki:FAQ&diff=79216AoPS Wiki:FAQ2016-07-07T21:52:50Z<p>Wlm2: /* Where can I test LaTeX commands? */</p>
<hr />
<div>{{shortcut|[[A:FAQ]]}}<br />
<br />
This is a community created list of Frequently Asked Questions about Art of Problem Solving. If you have a request to edit or add a question on this page, please make it [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=416&t=414129 here].<br />
<br />
== General==<br />
<br />
<br />
==== Can I change my user name? ====<br />
<br />
:As indicated during the time of your registration, you are unable to change your username. However, if you have a strong reason for doing so, you can PM an admin and they will decide if your reason is worthy of having a username change.<br />
<br />
==== Can I make more than one account? ====<br />
<br />
:It is preferred that you have one and only one account. Having more leads to issues of not remembering on what account you did what. Using multiple accounts to "game" the system, (e.g., increase rating for posts or in online games) will lead to bans on all accounts associated to you. If you have already made additional accounts, please choose one account and stop using the others.<br />
<br />
====What software does Art of Problem Solving use to run the website?====<br />
<br />
:* Search: Solr<br />
:* Wiki: MediaWiki<br />
:* Asymptote and Latex are generated through their respective binary packages<br />
:* Videos: YouTube<br />
<br />
All other parts of the website are custom built.<br />
<br />
<br />
====Can you make an AoPS App?====<br />
<br />
:There are currently no plans to build an app. Any app built would work almost identically to the website, and not be any faster, so there is little value in building an app.<br />
<br />
== Forums ==<br />
<br />
==== How do I format my post, e.g. bold text, add URLs, etc.? ====<br />
<br />
:AoPS is based on a markup language called BBCode. A tutorial of its functions on AoPS and how to use them can be found [[BBCode:Tutorial|here]].<br />
<br />
==== How do I hide content in the forums? ====<br />
:Wrap the content you want to hide in [hide] tags.<br />
[hide]Content[/hide]<br />
:If you want to customize the label, instead of saying "Click here to reveal hidden text", you can do something like:<br />
[hide=Label to display]Content[/hide]<br />
<br />
==== I got the message "You can not post at this time" when trying to post, why? ====<br />
<br />
:New users are not allowed to post messages with URLs and various other things. Once you have five posts you can post normally.<br />
<br />
====I got the message "Too many messages." when trying to send a private message, why?====<br />
:To prevent PM spam abuse, users with less than five forum posts are limited to four private messages within a forty-eight hour period.<br />
<br />
==== If I make more posts, it means I'm a better user, right? ====<br />
<br />
:Absolutely not. Post quality is far more important than post quantity. Users making a lot of senseless posts are often considered worse users, or spammers.<br />
<br />
==== I have made some posts but my post count did not increase. Why? ====<br />
<br />
:When you post in some of the forums, such as the Test Forum, Mafia Forum, and the Fun Factory, it does not count towards your post count.<br />
<br />
==== How does AoPS select moderators? ====<br />
<br />
:When a new moderator is needed in the forums, AoPS administrators first check if any current moderators could serve as a moderator of the forum which needs a moderator. Should none be found, AoPS administrators and/or other moderators scour the forum looking for productive users. They may also ask for suggestions from other moderators or trusted users on the site. Once they have pinpointed a possible candidate based on their long term usage of the site, productive posts in the forum, and having no recent behavioral issues, that user is asked if he or she would like to moderate the forum. <br />
<br />
:Less active forums often have no moderator. Inappropriate posts should be reported by users and administrators will take appropriate action.<br />
<br />
:AoPS receives MANY requests to be a moderator. As they receive so many, it is possible that you won't get a response should you request to be one. Also, AoPS very rarely makes someone a mod for asking to be one, so '''please do not ask'''.<br />
<br />
==== I believe a post needs corrective action. What should I do? ====<br />
<br />
:If you believe a post needs moderative action, you may report it by clicking the "!" icon on the upper-right corner of that post. If it's a minor mistake, you may want to PM the offending user instead and explain how they can make their post better. Usually, you shouldn't publicly post such things on a thread itself, which is called "backseat moderation" and is considered rude.<br />
<br />
==== How long of a non-commented thread is considered reviving? ====<br />
<br />
:If any post is still on-topic and isn't spammy or anything, it isn't considered reviving. However, everyone has a different period of time that they consider reviving. In general, apply common sense.<br />
<br />
==== Someone is marking all my posts as spam, what should I do? ====<br />
<br />
:It happens to everyone. There's really not much you can do.<br />
<br />
==== Are posts marked spam more often better than good? ====<br />
<br />
:No.<br />
<br />
==== How do I post images? ====<br />
<br />
:While AoPS forums have the ability to attach images, we do not generally recommend doing so, as we can not guarantee the images will be available through upgrades, restorations, etc. We also have limited disk space which causes us to remove attachments from time to time. Therefore, we recommend using a third party image hosting solution. There are many options, but we recommend imgur.com.<br />
<br />
:* Go to imgur.com<br />
:* Click upload images<br />
:* Follow the on screen instructions to upload the image to imgur.<br />
:* After uploading, you'll be presented the uploaded image along with links on the left.<br />
:* Find the link labeled BBCode (message boards & forums)<br />
:* Copy the code, and paste into your post. It will look something like:<br />
<br />
[img]http://i.imgur.com/aBcDeFgH.jpg[/img]<br />
<br />
== Blogs ==<br />
==== How come I can't create a blog? ====<br />
:One needs to have at least 5 posts in order to make a blog.<br />
==== How do I make my blog look nice? ====<br />
:Many AoPSers make their blogs look awesome by applying [[CSS|CSS]], which is a high-level stylesheet language. This can be done by typing CSS code into the CSS box in the Blog Control Panel.<br />
<br />
== Contests ==<br />
==== Where can I find past contest questions and solutions? ====<br />
:In the [http://www.artofproblemsolving.com/Forum/resources.php Contests] section.<br />
<br />
==== How do I get problems onto the contest page? ====<br />
<br />
:Make a topic for each question in the appropriate forum, copy/paste the urls to the National Olympiad. Your problems may eventually be submitted into the Contest page.<br />
<br />
==== Who can I ask to add posts to the contests section? ====<br />
:Any one of the members in the the [http://www.artofproblemsolving.com/Forum/memberlist.php?mode=group&g=417 RManagers] group.<br />
<br />
==== What are the guidelines for posting problems to be added to the contests section? ====<br />
:Refer to the [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=144&t=195579 guidelines in this post].<br />
<br />
==== Why is the wiki missing many contest questions? ====<br />
:Generally, it is because users have not yet posted them onto the wiki (translation difficulties, not having access to the actual problems, lack of interest, etc). If you have a copy, please post the problems in the Community Section! In some cases, however, problems may be missing due to copyright claims from maths organizations. See, for example, [http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1391106#p1391106 this post].<br />
<br />
==== What if I find an error on a problem? ====<br />
Please post an accurate description of the problem in [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=133&t=426693 this thread]<br />
<br />
== LaTeX and Asymptote ==<br />
==== What is LaTeX, and how do I use it? ====<br />
<br />
:<math>\LaTeX</math> is a typesetting markup language that is useful to produce properly formatted mathematical and scientific expressions.<br />
<br />
==== How can I download LaTeX to use on the forums? ====<br />
<br />
:There are no downloads necessary; the forums and the wiki render LaTeX commands between dollar signs. <br />
<br />
==== How can I download LaTeX for personal use? ====<br />
:You can download TeXstudio [http://texstudio.sourceforge.net here] or TeXnicCenter [http://www.texniccenter.org here]<br />
<br />
==== Where can I find a list of LaTeX commands? ====<br />
:See [[LaTeX:Symbols|here]].<br />
<br />
==== Where can I test LaTeX commands? ====<br />
<br />
:[[A:SAND|Sandbox]] or [http://www.artofproblemsolving.com/Resources/texer.php TeXeR]. You can also use our [http://artofproblemsolving.com/community/c67_test_forum Test Forum].<br />
<br />
==== Where can I find examples of Asymptote diagrams and code? ====<br />
<br />
:Search this wiki for the <tt><nowiki><asy></nowiki></tt> tag or the Forums for the <tt><nowiki>[asy]</nowiki></tt> tag. See also [[Asymptote:_Useful_commands_and_their_Output|these examples]] and [[Proofs without words|this article]] (click on the images to obtain the code).<br />
<br />
==== How can I draw 3D diagrams? ====<br />
<br />
:See [[Asymptote: 3D graphics]].<br />
<br />
==== What is the cse5 package? ==== <br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=149650 here]. The package contains a set of shorthand commands that implement the behavior of usual commands, for example <tt>D()</tt> for <tt>draw()</tt> and <tt>dot()</tt>, and so forth.<br />
<br />
==== What is the olympiad package? ====<br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=165767 here]. The package contains a set of commands useful for drawing diagrams related to [[:Category:Olympiad Geometry Problems|olympiad geometry problems]].<br />
<br />
== AoPSWiki ==<br />
==== Is there a guide for wiki syntax? ====<br />
<br />
:See [http://en.wikipedia.org/wiki/Help:Wiki_markup wiki markup], [[AoPSWiki:Tutorial]], and [[Help:Contents]].<br />
<br />
==== What do I do if I see a mistake in the wiki? ====<br />
<br />
:Edit the page and correct the error! You can edit most pages on the wiki. Click the "edit" button on the right sidebar to edit a page.<br />
<br />
==== Why can't I edit the wiki? ====<br />
<br />
You must be a registered user on Aops to edit. To be registered, make sure you give a correct email, and activate your account.<br />
<br />
== Miscellaneous ==<br />
==== Is it possible to join the AoPS Staff? ====<br />
<br />
:Yes. Mr. Rusczyk will sometimes hire a small army of college students to work as interns, graders, and teaching assistants. You must be at least in your second semester of your senior year and be legal to work in the U.S. (at least 16).<br />
<br />
==== What is the minimum age to be an assistant in an Art of Problem Solving class? ====<br />
<br />
:You must have graduated from high school, or at least be in the second term of your senior year.<br />
<br />
==AoPS Acronyms==<br />
*'''AFK'''- Away from keyboard<br />
*'''AoPS'''- Art of Problem Solving, the website you're on right now!<br />
*'''AIME'''- American Invitational Mathematics Examination<br />
*'''AMC'''- American Math Competitions<br />
*'''ATM'''- At the Moment<br />
*'''brb'''- Be right Back<br />
*'''BTW'''- By the way<br />
*'''CEMC''' - Centre for Mathematics and Computing<br />
*'''C&P or C+P''' - Counting and Probability or Contests and Programs<br />
*'''EBWOP'''- Editing by way of post<br />
*'''FTW'''- For the Win, a game on AoPS<br />
*'''gg'''- Good Game<br />
*'''gj'''- Good Job<br />
*'''glhf'''-Good Luck Have Fun<br />
*'''gtg''' - Got to go<br />
*'''ID(R)K'''-I Don't (Really) Know<br />
*'''iff'''-If and only if<br />
*'''IIRC'''- If I recall correctly<br />
*'''IMO'''- In my opinion (or International Math Olympiad, depending on context)<br />
*'''JMO'''- United States of America Junior Mathematical Olympiad<br />
*'''lol'''- Laugh Out Loud<br />
*'''MC'''- Mathcounts, a popular math contest for Middle School students.<br />
*'''MOP'''- Mathematical Olympiad (Summer) Program<br />
*'''MSM'''- Middle School Math<br />
*'''NT'''- Number Theory<br />
*'''OBC'''- Online by computer<br />
*'''OMG'''- Oh My Gosh.<br />
*'''OP'''- Original Poster/Original Post/Original Problem, or Overpowered/Overpowering<br />
*'''QED'''- Quod erat demonstrandum, Latin for Which was to be proven; some English mathematicians use it as an acronym for Quite Elegantly Done<br />
*'''QS&A'''- Questions, Suggestions, and Announcements Forum<br />
*'''ro(t)fl''' - Rolling on the floor laughing<br />
*'''sa''' - sa<br />
*'''smh''' - Shaking my head<br />
*'''USA(J)MO'''- USA (Junior) Mathematical Olympiad<br />
*'''V/LA'''- Vacation or Long Absence/Limited Access<br />
*'''WLOG'''- Without loss of generality<br />
*'''wrt'''- With respect to<br />
*'''wtg''' - Way to go<br />
*'''tytia'''- Thank you, that is all<br />
*'''xD'''- Bursting Laugh<br />
<br />
== FTW! ==<br />
<br />
==== How do I access FTW? ====<br />
You can access FTW by clicking For the Win! from the Resources drop-down menu at the top of the page.<br />
<br />
==== Did FTW miscount my number of games?====<br />
<br />
No! However, the (Overall) rating statistics do not count games with less than 6 problems or less than 15 seconds.<br />
<br />
For example, if you have played 30 games, but not all of them were 6 problems or higher, then you will still be muted.<br />
<br />
== School ==<br />
<br />
==== What if I want to drop out of a class? ====<br />
:For any course with more than 2 classes, students can drop the course any time before the third class begins and receive a full refund. No drops are allowed after the third class has started. To drop the class, go to the My Classes section by clicking the My Classes link at the top-right of the website. Then find the area on the right side of the page that lets you drop the class. A refund will be processed within 10 business days.<br />
<br />
==== What if I miss a class? ====<br />
:There are classroom transcripts available under My Classes, available at the top right of the web site. You can view these transcripts in order to review any missed material. You can also ask questions on the class message board. Don't worry, though, classroom participation usually isn't weighted heavily.<br />
<br />
==== Is there audio or video in class? ====<br />
:There is generally no audio or video in the class. The classes are generally completely text based, in an interactive chat room environment, which allows students to ask questions at any time during the class. In addition to audio and video limiting interactivity, the technology isn't quite there yet for all students to be able to adequately receive streaming audio and video.<br />
<br />
====I feel like joining! What are my class choices? ====<br />
:[http://www.artofproblemsolving.com/School/classlist.php Class List] [http://www.artofproblemsolving.com/School/index.php?page=school.instructors Instructors List]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Wiki:FAQ&diff=79215AoPS Wiki:FAQ2016-07-07T21:41:19Z<p>Wlm2: /* How do you access FTW? */</p>
<hr />
<div>{{shortcut|[[A:FAQ]]}}<br />
<br />
This is a community created list of Frequently Asked Questions about Art of Problem Solving. If you have a request to edit or add a question on this page, please make it [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=416&t=414129 here].<br />
<br />
== General==<br />
<br />
<br />
==== Can I change my user name? ====<br />
<br />
:As indicated during the time of your registration, you are unable to change your username. However, if you have a strong reason for doing so, you can PM an admin and they will decide if your reason is worthy of having a username change.<br />
<br />
==== Can I make more than one account? ====<br />
<br />
:It is preferred that you have one and only one account. Having more leads to issues of not remembering on what account you did what. Using multiple accounts to "game" the system, (e.g., increase rating for posts or in online games) will lead to bans on all accounts associated to you. If you have already made additional accounts, please choose one account and stop using the others.<br />
<br />
====What software does Art of Problem Solving use to run the website?====<br />
<br />
:* Search: Solr<br />
:* Wiki: MediaWiki<br />
:* Asymptote and Latex are generated through their respective binary packages<br />
:* Videos: YouTube<br />
<br />
All other parts of the website are custom built.<br />
<br />
<br />
====Can you make an AoPS App?====<br />
<br />
:There are currently no plans to build an app. Any app built would work almost identically to the website, and not be any faster, so there is little value in building an app.<br />
<br />
== Forums ==<br />
<br />
==== How do I format my post, e.g. bold text, add URLs, etc.? ====<br />
<br />
:AoPS is based on a markup language called BBCode. A tutorial of its functions on AoPS and how to use them can be found [[BBCode:Tutorial|here]].<br />
<br />
==== How do I hide content in the forums? ====<br />
:Wrap the content you want to hide in [hide] tags.<br />
[hide]Content[/hide]<br />
:If you want to customize the label, instead of saying "Click here to reveal hidden text", you can do something like:<br />
[hide=Label to display]Content[/hide]<br />
<br />
==== I got the message "You can not post at this time" when trying to post, why? ====<br />
<br />
:New users are not allowed to post messages with URLs and various other things. Once you have five posts you can post normally.<br />
<br />
====I got the message "Too many messages." when trying to send a private message, why?====<br />
:To prevent PM spam abuse, users with less than five forum posts are limited to four private messages within a forty-eight hour period.<br />
<br />
==== If I make more posts, it means I'm a better user, right? ====<br />
<br />
:Absolutely not. Post quality is far more important than post quantity. Users making a lot of senseless posts are often considered worse users, or spammers.<br />
<br />
==== I have made some posts but my post count did not increase. Why? ====<br />
<br />
:When you post in some of the forums, such as the Test Forum, Mafia Forum, and the Fun Factory, it does not count towards your post count.<br />
<br />
==== How does AoPS select moderators? ====<br />
<br />
:When a new moderator is needed in the forums, AoPS administrators first check if any current moderators could serve as a moderator of the forum which needs a moderator. Should none be found, AoPS administrators and/or other moderators scour the forum looking for productive users. They may also ask for suggestions from other moderators or trusted users on the site. Once they have pinpointed a possible candidate based on their long term usage of the site, productive posts in the forum, and having no recent behavioral issues, that user is asked if he or she would like to moderate the forum. <br />
<br />
:Less active forums often have no moderator. Inappropriate posts should be reported by users and administrators will take appropriate action.<br />
<br />
:AoPS receives MANY requests to be a moderator. As they receive so many, it is possible that you won't get a response should you request to be one. Also, AoPS very rarely makes someone a mod for asking to be one, so '''please do not ask'''.<br />
<br />
==== I believe a post needs corrective action. What should I do? ====<br />
<br />
:If you believe a post needs moderative action, you may report it by clicking the "!" icon on the upper-right corner of that post. If it's a minor mistake, you may want to PM the offending user instead and explain how they can make their post better. Usually, you shouldn't publicly post such things on a thread itself, which is called "backseat moderation" and is considered rude.<br />
<br />
==== How long of a non-commented thread is considered reviving? ====<br />
<br />
:If any post is still on-topic and isn't spammy or anything, it isn't considered reviving. However, everyone has a different period of time that they consider reviving. In general, apply common sense.<br />
<br />
==== Someone is marking all my posts as spam, what should I do? ====<br />
<br />
:It happens to everyone. There's really not much you can do.<br />
<br />
==== Are posts marked spam more often better than good? ====<br />
<br />
:No.<br />
<br />
==== How do I post images? ====<br />
<br />
:While AoPS forums have the ability to attach images, we do not generally recommend doing so, as we can not guarantee the images will be available through upgrades, restorations, etc. We also have limited disk space which causes us to remove attachments from time to time. Therefore, we recommend using a third party image hosting solution. There are many options, but we recommend imgur.com.<br />
<br />
:* Go to imgur.com<br />
:* Click upload images<br />
:* Follow the on screen instructions to upload the image to imgur.<br />
:* After uploading, you'll be presented the uploaded image along with links on the left.<br />
:* Find the link labeled BBCode (message boards & forums)<br />
:* Copy the code, and paste into your post. It will look something like:<br />
<br />
[img]http://i.imgur.com/aBcDeFgH.jpg[/img]<br />
<br />
== Blogs ==<br />
==== How come I can't create a blog? ====<br />
:One needs to have at least 5 posts in order to make a blog.<br />
==== How do I make my blog look nice? ====<br />
:Many AoPSers make their blogs look awesome by applying [[CSS|CSS]], which is a high-level stylesheet language. This can be done by typing CSS code into the CSS box in the Blog Control Panel.<br />
<br />
== Contests ==<br />
==== Where can I find past contest questions and solutions? ====<br />
:In the [http://www.artofproblemsolving.com/Forum/resources.php Contests] section.<br />
<br />
==== How do I get problems onto the contest page? ====<br />
<br />
:Make a topic for each question in the appropriate forum, copy/paste the urls to the National Olympiad. Your problems may eventually be submitted into the Contest page.<br />
<br />
==== Who can I ask to add posts to the contests section? ====<br />
:Any one of the members in the the [http://www.artofproblemsolving.com/Forum/memberlist.php?mode=group&g=417 RManagers] group.<br />
<br />
==== What are the guidelines for posting problems to be added to the contests section? ====<br />
:Refer to the [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=144&t=195579 guidelines in this post].<br />
<br />
==== Why is the wiki missing many contest questions? ====<br />
:Generally, it is because users have not yet posted them onto the wiki (translation difficulties, not having access to the actual problems, lack of interest, etc). If you have a copy, please post the problems in the Community Section! In some cases, however, problems may be missing due to copyright claims from maths organizations. See, for example, [http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1391106#p1391106 this post].<br />
<br />
==== What if I find an error on a problem? ====<br />
Please post an accurate description of the problem in [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=133&t=426693 this thread]<br />
<br />
== LaTeX and Asymptote ==<br />
==== What is LaTeX, and how do I use it? ====<br />
<br />
:<math>\LaTeX</math> is a typesetting markup language that is useful to produce properly formatted mathematical and scientific expressions.<br />
<br />
==== How can I download LaTeX to use on the forums? ====<br />
<br />
:There are no downloads necessary; the forums and the wiki render LaTeX commands between dollar signs. <br />
<br />
==== How can I download LaTeX for personal use? ====<br />
:You can download TeXstudio [http://texstudio.sourceforge.net here] or TeXnicCenter [http://www.texniccenter.org here]<br />
<br />
==== Where can I find a list of LaTeX commands? ====<br />
:See [[LaTeX:Symbols|here]].<br />
<br />
==== Where can I test LaTeX commands? ====<br />
<br />
:[[A:SAND|Sandbox]] or [http://www.artofproblemsolving.com/Resources/texer.php TeXeR]. <br />
<br />
==== Where can I find examples of Asymptote diagrams and code? ====<br />
<br />
:Search this wiki for the <tt><nowiki><asy></nowiki></tt> tag or the Forums for the <tt><nowiki>[asy]</nowiki></tt> tag. See also [[Asymptote:_Useful_commands_and_their_Output|these examples]] and [[Proofs without words|this article]] (click on the images to obtain the code).<br />
<br />
==== How can I draw 3D diagrams? ====<br />
<br />
:See [[Asymptote: 3D graphics]].<br />
<br />
==== What is the cse5 package? ==== <br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=149650 here]. The package contains a set of shorthand commands that implement the behavior of usual commands, for example <tt>D()</tt> for <tt>draw()</tt> and <tt>dot()</tt>, and so forth.<br />
<br />
==== What is the olympiad package? ====<br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=165767 here]. The package contains a set of commands useful for drawing diagrams related to [[:Category:Olympiad Geometry Problems|olympiad geometry problems]].<br />
<br />
== AoPSWiki ==<br />
==== Is there a guide for wiki syntax? ====<br />
<br />
:See [http://en.wikipedia.org/wiki/Help:Wiki_markup wiki markup], [[AoPSWiki:Tutorial]], and [[Help:Contents]].<br />
<br />
==== What do I do if I see a mistake in the wiki? ====<br />
<br />
:Edit the page and correct the error! You can edit most pages on the wiki. Click the "edit" button on the right sidebar to edit a page.<br />
<br />
==== Why can't I edit the wiki? ====<br />
<br />
You must be a registered user on Aops to edit. To be registered, make sure you give a correct email, and activate your account.<br />
<br />
== Miscellaneous ==<br />
==== Is it possible to join the AoPS Staff? ====<br />
<br />
:Yes. Mr. Rusczyk will sometimes hire a small army of college students to work as interns, graders, and teaching assistants. You must be at least in your second semester of your senior year and be legal to work in the U.S. (at least 16).<br />
<br />
==== What is the minimum age to be an assistant in an Art of Problem Solving class? ====<br />
<br />
:You must have graduated from high school, or at least be in the second term of your senior year.<br />
<br />
==AoPS Acronyms==<br />
*'''AFK'''- Away from keyboard<br />
*'''AoPS'''- Art of Problem Solving, the website you're on right now!<br />
*'''AIME'''- American Invitational Mathematics Examination<br />
*'''AMC'''- American Math Competitions<br />
*'''ATM'''- At the Moment<br />
*'''brb'''- Be right Back<br />
*'''BTW'''- By the way<br />
*'''CEMC''' - Centre for Mathematics and Computing<br />
*'''C&P or C+P''' - Counting and Probability or Contests and Programs<br />
*'''EBWOP'''- Editing by way of post<br />
*'''FTW'''- For the Win, a game on AoPS<br />
*'''gg'''- Good Game<br />
*'''gj'''- Good Job<br />
*'''glhf'''-Good Luck Have Fun<br />
*'''gtg''' - Got to go<br />
*'''ID(R)K'''-I Don't (Really) Know<br />
*'''iff'''-If and only if<br />
*'''IIRC'''- If I recall correctly<br />
*'''IMO'''- In my opinion (or International Math Olympiad, depending on context)<br />
*'''JMO'''- United States of America Junior Mathematical Olympiad<br />
*'''lol'''- Laugh Out Loud<br />
*'''MC'''- Mathcounts, a popular math contest for Middle School students.<br />
*'''MOP'''- Mathematical Olympiad (Summer) Program<br />
*'''MSM'''- Middle School Math<br />
*'''NT'''- Number Theory<br />
*'''OBC'''- Online by computer<br />
*'''OMG'''- Oh My Gosh.<br />
*'''OP'''- Original Poster/Original Post/Original Problem, or Overpowered/Overpowering<br />
*'''QED'''- Quod erat demonstrandum, Latin for Which was to be proven; some English mathematicians use it as an acronym for Quite Elegantly Done<br />
*'''QS&A'''- Questions, Suggestions, and Announcements Forum<br />
*'''ro(t)fl''' - Rolling on the floor laughing<br />
*'''sa''' - sa<br />
*'''smh''' - Shaking my head<br />
*'''USA(J)MO'''- USA (Junior) Mathematical Olympiad<br />
*'''V/LA'''- Vacation or Long Absence/Limited Access<br />
*'''WLOG'''- Without loss of generality<br />
*'''wrt'''- With respect to<br />
*'''wtg''' - Way to go<br />
*'''tytia'''- Thank you, that is all<br />
*'''xD'''- Bursting Laugh<br />
<br />
== FTW! ==<br />
<br />
==== How do I access FTW? ====<br />
You can access FTW by clicking For the Win! from the Resources drop-down menu at the top of the page.<br />
<br />
==== Did FTW miscount my number of games?====<br />
<br />
No! However, the (Overall) rating statistics do not count games with less than 6 problems or less than 15 seconds.<br />
<br />
For example, if you have played 30 games, but not all of them were 6 problems or higher, then you will still be muted.<br />
<br />
== School ==<br />
<br />
==== What if I want to drop out of a class? ====<br />
:For any course with more than 2 classes, students can drop the course any time before the third class begins and receive a full refund. No drops are allowed after the third class has started. To drop the class, go to the My Classes section by clicking the My Classes link at the top-right of the website. Then find the area on the right side of the page that lets you drop the class. A refund will be processed within 10 business days.<br />
<br />
==== What if I miss a class? ====<br />
:There are classroom transcripts available under My Classes, available at the top right of the web site. You can view these transcripts in order to review any missed material. You can also ask questions on the class message board. Don't worry, though, classroom participation usually isn't weighted heavily.<br />
<br />
==== Is there audio or video in class? ====<br />
:There is generally no audio or video in the class. The classes are generally completely text based, in an interactive chat room environment, which allows students to ask questions at any time during the class. In addition to audio and video limiting interactivity, the technology isn't quite there yet for all students to be able to adequately receive streaming audio and video.<br />
<br />
====I feel like joining! What are my class choices? ====<br />
:[http://www.artofproblemsolving.com/School/classlist.php Class List] [http://www.artofproblemsolving.com/School/index.php?page=school.instructors Instructors List]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Wiki:FAQ&diff=79214AoPS Wiki:FAQ2016-07-07T21:39:45Z<p>Wlm2: /* What if I miss a class? */</p>
<hr />
<div>{{shortcut|[[A:FAQ]]}}<br />
<br />
This is a community created list of Frequently Asked Questions about Art of Problem Solving. If you have a request to edit or add a question on this page, please make it [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=416&t=414129 here].<br />
<br />
== General==<br />
<br />
<br />
==== Can I change my user name? ====<br />
<br />
:As indicated during the time of your registration, you are unable to change your username. However, if you have a strong reason for doing so, you can PM an admin and they will decide if your reason is worthy of having a username change.<br />
<br />
==== Can I make more than one account? ====<br />
<br />
:It is preferred that you have one and only one account. Having more leads to issues of not remembering on what account you did what. Using multiple accounts to "game" the system, (e.g., increase rating for posts or in online games) will lead to bans on all accounts associated to you. If you have already made additional accounts, please choose one account and stop using the others.<br />
<br />
====What software does Art of Problem Solving use to run the website?====<br />
<br />
:* Search: Solr<br />
:* Wiki: MediaWiki<br />
:* Asymptote and Latex are generated through their respective binary packages<br />
:* Videos: YouTube<br />
<br />
All other parts of the website are custom built.<br />
<br />
<br />
====Can you make an AoPS App?====<br />
<br />
:There are currently no plans to build an app. Any app built would work almost identically to the website, and not be any faster, so there is little value in building an app.<br />
<br />
== Forums ==<br />
<br />
==== How do I format my post, e.g. bold text, add URLs, etc.? ====<br />
<br />
:AoPS is based on a markup language called BBCode. A tutorial of its functions on AoPS and how to use them can be found [[BBCode:Tutorial|here]].<br />
<br />
==== How do I hide content in the forums? ====<br />
:Wrap the content you want to hide in [hide] tags.<br />
[hide]Content[/hide]<br />
:If you want to customize the label, instead of saying "Click here to reveal hidden text", you can do something like:<br />
[hide=Label to display]Content[/hide]<br />
<br />
==== I got the message "You can not post at this time" when trying to post, why? ====<br />
<br />
:New users are not allowed to post messages with URLs and various other things. Once you have five posts you can post normally.<br />
<br />
====I got the message "Too many messages." when trying to send a private message, why?====<br />
:To prevent PM spam abuse, users with less than five forum posts are limited to four private messages within a forty-eight hour period.<br />
<br />
==== If I make more posts, it means I'm a better user, right? ====<br />
<br />
:Absolutely not. Post quality is far more important than post quantity. Users making a lot of senseless posts are often considered worse users, or spammers.<br />
<br />
==== I have made some posts but my post count did not increase. Why? ====<br />
<br />
:When you post in some of the forums, such as the Test Forum, Mafia Forum, and the Fun Factory, it does not count towards your post count.<br />
<br />
==== How does AoPS select moderators? ====<br />
<br />
:When a new moderator is needed in the forums, AoPS administrators first check if any current moderators could serve as a moderator of the forum which needs a moderator. Should none be found, AoPS administrators and/or other moderators scour the forum looking for productive users. They may also ask for suggestions from other moderators or trusted users on the site. Once they have pinpointed a possible candidate based on their long term usage of the site, productive posts in the forum, and having no recent behavioral issues, that user is asked if he or she would like to moderate the forum. <br />
<br />
:Less active forums often have no moderator. Inappropriate posts should be reported by users and administrators will take appropriate action.<br />
<br />
:AoPS receives MANY requests to be a moderator. As they receive so many, it is possible that you won't get a response should you request to be one. Also, AoPS very rarely makes someone a mod for asking to be one, so '''please do not ask'''.<br />
<br />
==== I believe a post needs corrective action. What should I do? ====<br />
<br />
:If you believe a post needs moderative action, you may report it by clicking the "!" icon on the upper-right corner of that post. If it's a minor mistake, you may want to PM the offending user instead and explain how they can make their post better. Usually, you shouldn't publicly post such things on a thread itself, which is called "backseat moderation" and is considered rude.<br />
<br />
==== How long of a non-commented thread is considered reviving? ====<br />
<br />
:If any post is still on-topic and isn't spammy or anything, it isn't considered reviving. However, everyone has a different period of time that they consider reviving. In general, apply common sense.<br />
<br />
==== Someone is marking all my posts as spam, what should I do? ====<br />
<br />
:It happens to everyone. There's really not much you can do.<br />
<br />
==== Are posts marked spam more often better than good? ====<br />
<br />
:No.<br />
<br />
==== How do I post images? ====<br />
<br />
:While AoPS forums have the ability to attach images, we do not generally recommend doing so, as we can not guarantee the images will be available through upgrades, restorations, etc. We also have limited disk space which causes us to remove attachments from time to time. Therefore, we recommend using a third party image hosting solution. There are many options, but we recommend imgur.com.<br />
<br />
:* Go to imgur.com<br />
:* Click upload images<br />
:* Follow the on screen instructions to upload the image to imgur.<br />
:* After uploading, you'll be presented the uploaded image along with links on the left.<br />
:* Find the link labeled BBCode (message boards & forums)<br />
:* Copy the code, and paste into your post. It will look something like:<br />
<br />
[img]http://i.imgur.com/aBcDeFgH.jpg[/img]<br />
<br />
== Blogs ==<br />
==== How come I can't create a blog? ====<br />
:One needs to have at least 5 posts in order to make a blog.<br />
==== How do I make my blog look nice? ====<br />
:Many AoPSers make their blogs look awesome by applying [[CSS|CSS]], which is a high-level stylesheet language. This can be done by typing CSS code into the CSS box in the Blog Control Panel.<br />
<br />
== Contests ==<br />
==== Where can I find past contest questions and solutions? ====<br />
:In the [http://www.artofproblemsolving.com/Forum/resources.php Contests] section.<br />
<br />
==== How do I get problems onto the contest page? ====<br />
<br />
:Make a topic for each question in the appropriate forum, copy/paste the urls to the National Olympiad. Your problems may eventually be submitted into the Contest page.<br />
<br />
==== Who can I ask to add posts to the contests section? ====<br />
:Any one of the members in the the [http://www.artofproblemsolving.com/Forum/memberlist.php?mode=group&g=417 RManagers] group.<br />
<br />
==== What are the guidelines for posting problems to be added to the contests section? ====<br />
:Refer to the [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=144&t=195579 guidelines in this post].<br />
<br />
==== Why is the wiki missing many contest questions? ====<br />
:Generally, it is because users have not yet posted them onto the wiki (translation difficulties, not having access to the actual problems, lack of interest, etc). If you have a copy, please post the problems in the Community Section! In some cases, however, problems may be missing due to copyright claims from maths organizations. See, for example, [http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1391106#p1391106 this post].<br />
<br />
==== What if I find an error on a problem? ====<br />
Please post an accurate description of the problem in [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=133&t=426693 this thread]<br />
<br />
== LaTeX and Asymptote ==<br />
==== What is LaTeX, and how do I use it? ====<br />
<br />
:<math>\LaTeX</math> is a typesetting markup language that is useful to produce properly formatted mathematical and scientific expressions.<br />
<br />
==== How can I download LaTeX to use on the forums? ====<br />
<br />
:There are no downloads necessary; the forums and the wiki render LaTeX commands between dollar signs. <br />
<br />
==== How can I download LaTeX for personal use? ====<br />
:You can download TeXstudio [http://texstudio.sourceforge.net here] or TeXnicCenter [http://www.texniccenter.org here]<br />
<br />
==== Where can I find a list of LaTeX commands? ====<br />
:See [[LaTeX:Symbols|here]].<br />
<br />
==== Where can I test LaTeX commands? ====<br />
<br />
:[[A:SAND|Sandbox]] or [http://www.artofproblemsolving.com/Resources/texer.php TeXeR]. <br />
<br />
==== Where can I find examples of Asymptote diagrams and code? ====<br />
<br />
:Search this wiki for the <tt><nowiki><asy></nowiki></tt> tag or the Forums for the <tt><nowiki>[asy]</nowiki></tt> tag. See also [[Asymptote:_Useful_commands_and_their_Output|these examples]] and [[Proofs without words|this article]] (click on the images to obtain the code).<br />
<br />
==== How can I draw 3D diagrams? ====<br />
<br />
:See [[Asymptote: 3D graphics]].<br />
<br />
==== What is the cse5 package? ==== <br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=149650 here]. The package contains a set of shorthand commands that implement the behavior of usual commands, for example <tt>D()</tt> for <tt>draw()</tt> and <tt>dot()</tt>, and so forth.<br />
<br />
==== What is the olympiad package? ====<br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=165767 here]. The package contains a set of commands useful for drawing diagrams related to [[:Category:Olympiad Geometry Problems|olympiad geometry problems]].<br />
<br />
== AoPSWiki ==<br />
==== Is there a guide for wiki syntax? ====<br />
<br />
:See [http://en.wikipedia.org/wiki/Help:Wiki_markup wiki markup], [[AoPSWiki:Tutorial]], and [[Help:Contents]].<br />
<br />
==== What do I do if I see a mistake in the wiki? ====<br />
<br />
:Edit the page and correct the error! You can edit most pages on the wiki. Click the "edit" button on the right sidebar to edit a page.<br />
<br />
==== Why can't I edit the wiki? ====<br />
<br />
You must be a registered user on Aops to edit. To be registered, make sure you give a correct email, and activate your account.<br />
<br />
== Miscellaneous ==<br />
==== Is it possible to join the AoPS Staff? ====<br />
<br />
:Yes. Mr. Rusczyk will sometimes hire a small army of college students to work as interns, graders, and teaching assistants. You must be at least in your second semester of your senior year and be legal to work in the U.S. (at least 16).<br />
<br />
==== What is the minimum age to be an assistant in an Art of Problem Solving class? ====<br />
<br />
:You must have graduated from high school, or at least be in the second term of your senior year.<br />
<br />
==AoPS Acronyms==<br />
*'''AFK'''- Away from keyboard<br />
*'''AoPS'''- Art of Problem Solving, the website you're on right now!<br />
*'''AIME'''- American Invitational Mathematics Examination<br />
*'''AMC'''- American Math Competitions<br />
*'''ATM'''- At the Moment<br />
*'''brb'''- Be right Back<br />
*'''BTW'''- By the way<br />
*'''CEMC''' - Centre for Mathematics and Computing<br />
*'''C&P or C+P''' - Counting and Probability or Contests and Programs<br />
*'''EBWOP'''- Editing by way of post<br />
*'''FTW'''- For the Win, a game on AoPS<br />
*'''gg'''- Good Game<br />
*'''gj'''- Good Job<br />
*'''glhf'''-Good Luck Have Fun<br />
*'''gtg''' - Got to go<br />
*'''ID(R)K'''-I Don't (Really) Know<br />
*'''iff'''-If and only if<br />
*'''IIRC'''- If I recall correctly<br />
*'''IMO'''- In my opinion (or International Math Olympiad, depending on context)<br />
*'''JMO'''- United States of America Junior Mathematical Olympiad<br />
*'''lol'''- Laugh Out Loud<br />
*'''MC'''- Mathcounts, a popular math contest for Middle School students.<br />
*'''MOP'''- Mathematical Olympiad (Summer) Program<br />
*'''MSM'''- Middle School Math<br />
*'''NT'''- Number Theory<br />
*'''OBC'''- Online by computer<br />
*'''OMG'''- Oh My Gosh.<br />
*'''OP'''- Original Poster/Original Post/Original Problem, or Overpowered/Overpowering<br />
*'''QED'''- Quod erat demonstrandum, Latin for Which was to be proven; some English mathematicians use it as an acronym for Quite Elegantly Done<br />
*'''QS&A'''- Questions, Suggestions, and Announcements Forum<br />
*'''ro(t)fl''' - Rolling on the floor laughing<br />
*'''sa''' - sa<br />
*'''smh''' - Shaking my head<br />
*'''USA(J)MO'''- USA (Junior) Mathematical Olympiad<br />
*'''V/LA'''- Vacation or Long Absence/Limited Access<br />
*'''WLOG'''- Without loss of generality<br />
*'''wrt'''- With respect to<br />
*'''wtg''' - Way to go<br />
*'''tytia'''- Thank you, that is all<br />
*'''xD'''- Bursting Laugh<br />
<br />
== FTW! ==<br />
<br />
==== How do you access FTW? ====<br />
You can access FTW by clicking For the Win! from the Resources menu at the top of the page.<br />
<br />
==== Did FTW miscount my number of games?====<br />
<br />
No! However, the (Overall) rating statistics do not count games with less than 6 problems or less than 15 seconds.<br />
<br />
For example, if you have played 30 games, but not all of them were 6 problems or higher, then you will still be muted.<br />
<br />
== School ==<br />
<br />
==== What if I want to drop out of a class? ====<br />
:For any course with more than 2 classes, students can drop the course any time before the third class begins and receive a full refund. No drops are allowed after the third class has started. To drop the class, go to the My Classes section by clicking the My Classes link at the top-right of the website. Then find the area on the right side of the page that lets you drop the class. A refund will be processed within 10 business days.<br />
<br />
==== What if I miss a class? ====<br />
:There are classroom transcripts available under My Classes, available at the top right of the web site. You can view these transcripts in order to review any missed material. You can also ask questions on the class message board. Don't worry, though, classroom participation usually isn't weighted heavily.<br />
<br />
==== Is there audio or video in class? ====<br />
:There is generally no audio or video in the class. The classes are generally completely text based, in an interactive chat room environment, which allows students to ask questions at any time during the class. In addition to audio and video limiting interactivity, the technology isn't quite there yet for all students to be able to adequately receive streaming audio and video.<br />
<br />
====I feel like joining! What are my class choices? ====<br />
:[http://www.artofproblemsolving.com/School/classlist.php Class List] [http://www.artofproblemsolving.com/School/index.php?page=school.instructors Instructors List]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Wiki:FAQ&diff=79213AoPS Wiki:FAQ2016-07-07T21:38:01Z<p>Wlm2: /* What do some of the acronyms such as "OP" stand for? */</p>
<hr />
<div>{{shortcut|[[A:FAQ]]}}<br />
<br />
This is a community created list of Frequently Asked Questions about Art of Problem Solving. If you have a request to edit or add a question on this page, please make it [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=416&t=414129 here].<br />
<br />
== General==<br />
<br />
<br />
==== Can I change my user name? ====<br />
<br />
:As indicated during the time of your registration, you are unable to change your username. However, if you have a strong reason for doing so, you can PM an admin and they will decide if your reason is worthy of having a username change.<br />
<br />
==== Can I make more than one account? ====<br />
<br />
:It is preferred that you have one and only one account. Having more leads to issues of not remembering on what account you did what. Using multiple accounts to "game" the system, (e.g., increase rating for posts or in online games) will lead to bans on all accounts associated to you. If you have already made additional accounts, please choose one account and stop using the others.<br />
<br />
====What software does Art of Problem Solving use to run the website?====<br />
<br />
:* Search: Solr<br />
:* Wiki: MediaWiki<br />
:* Asymptote and Latex are generated through their respective binary packages<br />
:* Videos: YouTube<br />
<br />
All other parts of the website are custom built.<br />
<br />
<br />
====Can you make an AoPS App?====<br />
<br />
:There are currently no plans to build an app. Any app built would work almost identically to the website, and not be any faster, so there is little value in building an app.<br />
<br />
== Forums ==<br />
<br />
==== How do I format my post, e.g. bold text, add URLs, etc.? ====<br />
<br />
:AoPS is based on a markup language called BBCode. A tutorial of its functions on AoPS and how to use them can be found [[BBCode:Tutorial|here]].<br />
<br />
==== How do I hide content in the forums? ====<br />
:Wrap the content you want to hide in [hide] tags.<br />
[hide]Content[/hide]<br />
:If you want to customize the label, instead of saying "Click here to reveal hidden text", you can do something like:<br />
[hide=Label to display]Content[/hide]<br />
<br />
==== I got the message "You can not post at this time" when trying to post, why? ====<br />
<br />
:New users are not allowed to post messages with URLs and various other things. Once you have five posts you can post normally.<br />
<br />
====I got the message "Too many messages." when trying to send a private message, why?====<br />
:To prevent PM spam abuse, users with less than five forum posts are limited to four private messages within a forty-eight hour period.<br />
<br />
==== If I make more posts, it means I'm a better user, right? ====<br />
<br />
:Absolutely not. Post quality is far more important than post quantity. Users making a lot of senseless posts are often considered worse users, or spammers.<br />
<br />
==== I have made some posts but my post count did not increase. Why? ====<br />
<br />
:When you post in some of the forums, such as the Test Forum, Mafia Forum, and the Fun Factory, it does not count towards your post count.<br />
<br />
==== How does AoPS select moderators? ====<br />
<br />
:When a new moderator is needed in the forums, AoPS administrators first check if any current moderators could serve as a moderator of the forum which needs a moderator. Should none be found, AoPS administrators and/or other moderators scour the forum looking for productive users. They may also ask for suggestions from other moderators or trusted users on the site. Once they have pinpointed a possible candidate based on their long term usage of the site, productive posts in the forum, and having no recent behavioral issues, that user is asked if he or she would like to moderate the forum. <br />
<br />
:Less active forums often have no moderator. Inappropriate posts should be reported by users and administrators will take appropriate action.<br />
<br />
:AoPS receives MANY requests to be a moderator. As they receive so many, it is possible that you won't get a response should you request to be one. Also, AoPS very rarely makes someone a mod for asking to be one, so '''please do not ask'''.<br />
<br />
==== I believe a post needs corrective action. What should I do? ====<br />
<br />
:If you believe a post needs moderative action, you may report it by clicking the "!" icon on the upper-right corner of that post. If it's a minor mistake, you may want to PM the offending user instead and explain how they can make their post better. Usually, you shouldn't publicly post such things on a thread itself, which is called "backseat moderation" and is considered rude.<br />
<br />
==== How long of a non-commented thread is considered reviving? ====<br />
<br />
:If any post is still on-topic and isn't spammy or anything, it isn't considered reviving. However, everyone has a different period of time that they consider reviving. In general, apply common sense.<br />
<br />
==== Someone is marking all my posts as spam, what should I do? ====<br />
<br />
:It happens to everyone. There's really not much you can do.<br />
<br />
==== Are posts marked spam more often better than good? ====<br />
<br />
:No.<br />
<br />
==== How do I post images? ====<br />
<br />
:While AoPS forums have the ability to attach images, we do not generally recommend doing so, as we can not guarantee the images will be available through upgrades, restorations, etc. We also have limited disk space which causes us to remove attachments from time to time. Therefore, we recommend using a third party image hosting solution. There are many options, but we recommend imgur.com.<br />
<br />
:* Go to imgur.com<br />
:* Click upload images<br />
:* Follow the on screen instructions to upload the image to imgur.<br />
:* After uploading, you'll be presented the uploaded image along with links on the left.<br />
:* Find the link labeled BBCode (message boards & forums)<br />
:* Copy the code, and paste into your post. It will look something like:<br />
<br />
[img]http://i.imgur.com/aBcDeFgH.jpg[/img]<br />
<br />
== Blogs ==<br />
==== How come I can't create a blog? ====<br />
:One needs to have at least 5 posts in order to make a blog.<br />
==== How do I make my blog look nice? ====<br />
:Many AoPSers make their blogs look awesome by applying [[CSS|CSS]], which is a high-level stylesheet language. This can be done by typing CSS code into the CSS box in the Blog Control Panel.<br />
<br />
== Contests ==<br />
==== Where can I find past contest questions and solutions? ====<br />
:In the [http://www.artofproblemsolving.com/Forum/resources.php Contests] section.<br />
<br />
==== How do I get problems onto the contest page? ====<br />
<br />
:Make a topic for each question in the appropriate forum, copy/paste the urls to the National Olympiad. Your problems may eventually be submitted into the Contest page.<br />
<br />
==== Who can I ask to add posts to the contests section? ====<br />
:Any one of the members in the the [http://www.artofproblemsolving.com/Forum/memberlist.php?mode=group&g=417 RManagers] group.<br />
<br />
==== What are the guidelines for posting problems to be added to the contests section? ====<br />
:Refer to the [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=144&t=195579 guidelines in this post].<br />
<br />
==== Why is the wiki missing many contest questions? ====<br />
:Generally, it is because users have not yet posted them onto the wiki (translation difficulties, not having access to the actual problems, lack of interest, etc). If you have a copy, please post the problems in the Community Section! In some cases, however, problems may be missing due to copyright claims from maths organizations. See, for example, [http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1391106#p1391106 this post].<br />
<br />
==== What if I find an error on a problem? ====<br />
Please post an accurate description of the problem in [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=133&t=426693 this thread]<br />
<br />
== LaTeX and Asymptote ==<br />
==== What is LaTeX, and how do I use it? ====<br />
<br />
:<math>\LaTeX</math> is a typesetting markup language that is useful to produce properly formatted mathematical and scientific expressions.<br />
<br />
==== How can I download LaTeX to use on the forums? ====<br />
<br />
:There are no downloads necessary; the forums and the wiki render LaTeX commands between dollar signs. <br />
<br />
==== How can I download LaTeX for personal use? ====<br />
:You can download TeXstudio [http://texstudio.sourceforge.net here] or TeXnicCenter [http://www.texniccenter.org here]<br />
<br />
==== Where can I find a list of LaTeX commands? ====<br />
:See [[LaTeX:Symbols|here]].<br />
<br />
==== Where can I test LaTeX commands? ====<br />
<br />
:[[A:SAND|Sandbox]] or [http://www.artofproblemsolving.com/Resources/texer.php TeXeR]. <br />
<br />
==== Where can I find examples of Asymptote diagrams and code? ====<br />
<br />
:Search this wiki for the <tt><nowiki><asy></nowiki></tt> tag or the Forums for the <tt><nowiki>[asy]</nowiki></tt> tag. See also [[Asymptote:_Useful_commands_and_their_Output|these examples]] and [[Proofs without words|this article]] (click on the images to obtain the code).<br />
<br />
==== How can I draw 3D diagrams? ====<br />
<br />
:See [[Asymptote: 3D graphics]].<br />
<br />
==== What is the cse5 package? ==== <br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=149650 here]. The package contains a set of shorthand commands that implement the behavior of usual commands, for example <tt>D()</tt> for <tt>draw()</tt> and <tt>dot()</tt>, and so forth.<br />
<br />
==== What is the olympiad package? ====<br />
<br />
:See [http://www.artofproblemsolving.com/Forum/viewtopic.php?f=519&t=165767 here]. The package contains a set of commands useful for drawing diagrams related to [[:Category:Olympiad Geometry Problems|olympiad geometry problems]].<br />
<br />
== AoPSWiki ==<br />
==== Is there a guide for wiki syntax? ====<br />
<br />
:See [http://en.wikipedia.org/wiki/Help:Wiki_markup wiki markup], [[AoPSWiki:Tutorial]], and [[Help:Contents]].<br />
<br />
==== What do I do if I see a mistake in the wiki? ====<br />
<br />
:Edit the page and correct the error! You can edit most pages on the wiki. Click the "edit" button on the right sidebar to edit a page.<br />
<br />
==== Why can't I edit the wiki? ====<br />
<br />
You must be a registered user on Aops to edit. To be registered, make sure you give a correct email, and activate your account.<br />
<br />
== Miscellaneous ==<br />
==== Is it possible to join the AoPS Staff? ====<br />
<br />
:Yes. Mr. Rusczyk will sometimes hire a small army of college students to work as interns, graders, and teaching assistants. You must be at least in your second semester of your senior year and be legal to work in the U.S. (at least 16).<br />
<br />
==== What is the minimum age to be an assistant in an Art of Problem Solving class? ====<br />
<br />
:You must have graduated from high school, or at least be in the second term of your senior year.<br />
<br />
==AoPS Acronyms==<br />
*'''AFK'''- Away from keyboard<br />
*'''AoPS'''- Art of Problem Solving, the website you're on right now!<br />
*'''AIME'''- American Invitational Mathematics Examination<br />
*'''AMC'''- American Math Competitions<br />
*'''ATM'''- At the Moment<br />
*'''brb'''- Be right Back<br />
*'''BTW'''- By the way<br />
*'''CEMC''' - Centre for Mathematics and Computing<br />
*'''C&P or C+P''' - Counting and Probability or Contests and Programs<br />
*'''EBWOP'''- Editing by way of post<br />
*'''FTW'''- For the Win, a game on AoPS<br />
*'''gg'''- Good Game<br />
*'''gj'''- Good Job<br />
*'''glhf'''-Good Luck Have Fun<br />
*'''gtg''' - Got to go<br />
*'''ID(R)K'''-I Don't (Really) Know<br />
*'''iff'''-If and only if<br />
*'''IIRC'''- If I recall correctly<br />
*'''IMO'''- In my opinion (or International Math Olympiad, depending on context)<br />
*'''JMO'''- United States of America Junior Mathematical Olympiad<br />
*'''lol'''- Laugh Out Loud<br />
*'''MC'''- Mathcounts, a popular math contest for Middle School students.<br />
*'''MOP'''- Mathematical Olympiad (Summer) Program<br />
*'''MSM'''- Middle School Math<br />
*'''NT'''- Number Theory<br />
*'''OBC'''- Online by computer<br />
*'''OMG'''- Oh My Gosh.<br />
*'''OP'''- Original Poster/Original Post/Original Problem, or Overpowered/Overpowering<br />
*'''QED'''- Quod erat demonstrandum, Latin for Which was to be proven; some English mathematicians use it as an acronym for Quite Elegantly Done<br />
*'''QS&A'''- Questions, Suggestions, and Announcements Forum<br />
*'''ro(t)fl''' - Rolling on the floor laughing<br />
*'''sa''' - sa<br />
*'''smh''' - Shaking my head<br />
*'''USA(J)MO'''- USA (Junior) Mathematical Olympiad<br />
*'''V/LA'''- Vacation or Long Absence/Limited Access<br />
*'''WLOG'''- Without loss of generality<br />
*'''wrt'''- With respect to<br />
*'''wtg''' - Way to go<br />
*'''tytia'''- Thank you, that is all<br />
*'''xD'''- Bursting Laugh<br />
<br />
== FTW! ==<br />
<br />
==== How do you access FTW? ====<br />
You can access FTW by clicking For the Win! from the Resources menu at the top of the page.<br />
<br />
==== Did FTW miscount my number of games?====<br />
<br />
No! However, the (Overall) rating statistics do not count games with less than 6 problems or less than 15 seconds.<br />
<br />
For example, if you have played 30 games, but not all of them were 6 problems or higher, then you will still be muted.<br />
<br />
== School ==<br />
<br />
==== What if I want to drop out of a class? ====<br />
:For any course with more than 2 classes, students can drop the course any time before the third class begins and receive a full refund. No drops are allowed after the third class has started. To drop the class, go to the My Classes section by clicking the My Classes link at the top-right of the website. Then find the area on the right side of the page that lets you drop the class. A refund will be processed within 10 business days.<br />
<br />
==== What if I miss a class? ====<br />
:There are classroom transcripts available under My Classes, available at the top right of the web site. You can view these transcripts in order to review any missed material. You can also ask questions on the class message board.<br />
<br />
==== Is there audio or video in class? ====<br />
:There is generally no audio or video in the class. The classes are generally completely text based, in an interactive chat room environment, which allows students to ask questions at any time during the class. In addition to audio and video limiting interactivity, the technology isn't quite there yet for all students to be able to adequately receive streaming audio and video.<br />
<br />
====I feel like joining! What are my class choices? ====<br />
:[http://www.artofproblemsolving.com/School/classlist.php Class List] [http://www.artofproblemsolving.com/School/index.php?page=school.instructors Instructors List]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=Getting_Started_With_Python_Programming&diff=79212Getting Started With Python Programming2016-07-07T21:33:45Z<p>Wlm2: /* Using the Python Shell */</p>
<hr />
<div>This guide takes you through the process of getting started with programming using the Python programming language. The sections flow from one to the next so it's recommended to read through this document in order from top to bottom.<br />
<br />
=Installing Python=<br />
<br />
Python is a very useful and popular computer language. Confusingly, Python has two major versions (2 and 3) and they are not fully compatible. We recommend using the most recent release of version 3. (This is the version that our [http://www.artofproblemsolving.com/School/courseinfo.php?course_id=python1 Introduction to Programming with Python course] uses -- if you are enrolled in that class, you '''must''' have Python 3.) There is absolutely nothing wrong with Python 2, as it is what most of today's technology supports and uses, but Python 3 is well on the way of replacing Python 2, so it will be more useful in a few years.<br />
<br />
Python is open-source software and is '''free''' to install and use. Here are installation instructions:<br />
<br />
#Go to the Python download page at http://www.python.org/download. Near the top of the page, there will be a list of download links for the Python 3.5.* installer. (The * will be replaced by a number -- as of mid-September 2015 the version is 3.5.0.) Click on the link that corresponds to your computer type (Windows or Mac, 32-bit or 64-bit -- if you're not sure, use the 32-bit version.) Some browsers will save the file automatically, others may pop up a box asking you if you want to save the file, in which case you should click the "save file" option. Depending on how your browser is configured, you may be asked where to save the file. If this is the case, keep track of where you save the installer.<br />
#Find where the installer was downloaded and double click on it to run it. On most browsers, you should simply be able to double-click the installer from the browser's "Downloads" window or menu. You may also have to click "Run" or "Yes" to a security window -- do this if necessary.<br />
#The setup wizard should launch. You should just click "Next" for every option in the setup wizard (i.e. use the defaults), unless you have some specific reason not to.<br />
#Familiarize yourself with the Python shell and IDLE text editor by running through the two sections below.<br />
<br />
=Using the Python Shell=<br />
The program that you'll use to run Python is called IDLE. It may be listed on your computer as "IDLE (Python GUI)". <br />
* On a Mac, IDLE should be in the Applications folder. <br />
* On Windows, IDLE should be accessible from the Start menu in a folder named "Python z5" (or something similar).<br />
The icon for IDLE looks something like this [[File:Idleicon.png]] or this [[File:Idleiconmac.png]]<br />
<br />
When you first open IDLE, you'll see the Python Shell (the numbers on your shell might be different than those shown below): <br />
<br />
[[File:Idle2-1.png]]<br />
<br />
(The screenshots in this article are taken using IDLE on a Mac with the font increased. Thus IDLE may look a little bit different for you but should still function similarly.)<br />
<br />
Note that the first line is the version of Python, which is 3.1.2 in the screenshot but should be 3.5.something if you installed it as directed above. Another thing to note is that in the lower right hand corner of the Python Shell you can see that it says "Ln: 4 Col: 4". This is just telling you where in the document your cursor is. In this case it's on line 4 and over in column 4. (The line and column number may be slightly different for your installation.)<br />
<br />
When you first start up Python on a Mac, you might get the following warning:<br />
: >>> WARNING: The version of Tcl/Tk (8.5.9) in use may be unstable.<br />
: Visit http://www.python.org/download/mac/tcltk/ for current information.<br />
If you get this warning, you'll need to update a graphics driver on your computer. Follow the link shown above and download and install the ActiveTcl driver that's recommended for the version of OS X that your Mac is running. This most likely will be 8.5.15.0, which you can also download directly from http://www.activestate.com/activetcl/downloads (IMPORTANT: you only need to do this step if you get the warning printed above when you start IDLE for the first time. If you don't get the warning, then everything is good to go.)<br />
<br />
<br />
The Python Shell is very useful for quick one-liners and short sequences of commands:<br />
<br />
[[File:Idle2-2.2.png]]<br />
<br />
Here we see a number of familiar operations: + for addition, - for subtraction, * for multiplication, and / for division. The last operation shown in the example, denoted by **, happens to be exponentiation. One neat feature to note about Python is that it can store arbitrarily large numbers (limited by the amount of memory your computer has). Trying some hefty exponentiation, we can see that we can compute with some pretty big numbers such as <math>2^{1000}</math> as illustrated below.<br />
<br />
[[File:Idle2-3.png]]<br />
<br />
While Python can make for a pretty good calculator, it can do a whole lot more. One example is when dealing with strings as follows:<br />
<br />
[[File:Idle2-4.png]]<br />
<br />
Here we are concatenating the three strings "python", "is", and "cool" by using the + operator. Notice that previously we used + to add numbers but now with strings, Python concatenates them! You may also note that the output of the operation gives us a string with single quotes around it. In Python, you are able to use single quotes or double quotes to denote a string. You can use them interchangeably.<br />
<br />
As a final example, we can even write code in the Python Shell that extends beyond a single line as shown below. We also see our first example of a <math>\verb=for=</math> loop.<br />
<br />
[[File:Idle2-5.png]]<br />
<br />
As you type the above, the Python Shell will automatically indent the second line for you. To let the Python Shell know that you're done and are ready for it to run your code, you'll need to put in an extra blank line by hitting the Enter key again. At that point it should run your code and print your output.<br />
<br />
Take some time to play around with the Python Shell. You'll want to go through a more extensive introduction to programming to learn the full extent of what you can do with Python, but you can still do some pretty nifty stuff by just playing around. The Python Shell also has an extensive built-in help system -- just type '''help()''' at the ">>>" prompt to get started and then follow the instructions it gives you.<br />
<br />
=The IDLE Text Editor and Your First Python Program=<br />
For most programming needs, you'll want to edit your program in a separate document and then run it. Happily, IDLE comes with its own built-in text editor.<br />
<br />
To get started, go to the File menu of the Python Shell and click on "New Window". This should give you a blank document with the title "Untitled" as shown below:<br />
<br />
[[File:Idle2-6.png]]<br />
<br />
You'll need to save your file before running it, so you might as well save it now. Make sure that you name your file with a name that ends in .py, so that your computer knows it is a Python program. Here we save ours as test.py:<br />
<br />
[[File:Idle2-7.png]]<br />
<br />
To get acquainted with the text editor, let's write our first Python program! Let's write a program to the following task:<br />
<br />
'''Find the sum of all the positive multiples of 3 below 1000.'''<br />
<br />
We solve this by keeping a running total: we'll start with the smallest positive multiple of 3 and go up one multiple at a time keeping track of the sum, stopping once we hit 1000. We can do this with the following code:<br />
<br />
[[File:Idle2-8.png]]<br />
<br />
Notice that as you type the above code, the keywords ("while" and "print") will automatically get colored -- this makes the code easier to read. Also, after typing the line "while i < 1000:", the editor will automatically start indenting for you. When you get to the line "print(total)", you'll need to use the backspace key to remove the indentation. It is important that the code look exactly like it does in the screenshot above: in Python, proper indentation is very important!<br />
<br />
This program basically works by incrementing <math>\verb=i=</math> by 3 every time and adding it to the <math>\verb=total=</math>. The <math>\verb%+=%</math> notation might be intimidating at first. However, the statement <math>\verb%i+=3%</math> is just a shorthand for <math>\verb%i = i + 3%</math>.<br />
<br />
Now that we've written this code, we probably want to run it and test it out. We can do so by going to the Run menu and hitting Run Module (shortcut F5). The program should execute and print out the answer to the Python Shell:<br />
<br />
[[File:Idle2-9.png]]<br />
<br />
The RESTART line just means that Python is clearing all the work you've previously done before it starts running your program. Then, the program runs and we get our answer, 166833. If instead you get an error message or a different answer, check that your program exactly matches the screenshot above, and try it again.<br />
<br />
=What's Next?=<br />
<br />
Now that you've learned the very basics of getting Python going, there's a bunch of tutorials you can look at which are [http://wiki.python.org/moin/BeginnersGuide/NonProgrammers listed] on the Python website. Go check them out!</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=LaTeX:Diagrams&diff=79211LaTeX:Diagrams2016-07-07T21:26:30Z<p>Wlm2: /* Diagrams and Figures */</p>
<hr />
<div>{{Latex}}<br />
<br />
== Diagrams and Figures ==<br />
To draw diagrams and figures, it's strongly recommended to rely on Asymptote, as LaTeX does not have the ability to output good diagrams for geometry and such, but does work incredibly well with the Asymptote language.</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=LaTeX:Symbols&diff=79210LaTeX:Symbols2016-07-07T21:21:48Z<p>Wlm2: /* Others */</p>
<hr />
<div>{{Latex}}<br />
<br />
This article will provide a short list of commonly used LaTeX symbols. <br />
<br />
== Common Symbols ==<br />
<br />
=== Operators ===<br />
<br />
=== Relations ===<br />
<br />
== Finding Other Symbols ==<br />
<br />
Here are some external resources for finding less commonly used symbols:<br />
<ul><br />
<li><br />
[http://detexify.kirelabs.org/classify.html Detexify] is an app which allows you to draw the symbol you'd like and shows you the <math>\LaTeX</math> code for it!<br />
<br/><br/></li><br />
<br />
<li><br />
MathJax (what allows us to use <math>\LaTeX</math> on the web) maintains a [http://docs.mathjax.org/en/latest/tex.html#supported-latex-commands list of supported commands].<br />
<br/><br/></li><br />
<br />
<li><br />
[http://mirrors.ctan.org/info/symbols/comprehensive/symbols-a4.pdf The Comprehensive LaTeX Symbol List].<br />
<br/><br/></li><br />
</ul><br />
<br />
-------------------------------------------------------------------------------------------------------------<br />
<br />
==Operators==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\pm</math>||\pm||<math>\mp</math>||\mp||<math>\times</math>||\times<br />
|-<br />
|<math>\div</math>||\div||<math>\cdot</math>||\cdot||<math>\ast</math>||\ast<br />
|-<br />
|<math>\star</math>||\star||<math>\dagger</math>||\dagger||<math>\ddagger</math>||\ddagger<br />
|-<br />
|<math>\amalg</math>||\amalg||<math>\cap</math>||\cap||<math>\cup</math>||\cup<br />
|-<br />
|<math>\uplus</math>||\uplus||<math>\sqcap</math>||\sqcap||<math>\sqcup</math>||\sqcup<br />
|-<br />
|<math>\vee</math>||\vee||<math>\wedge</math>||\wedge||<math>\oplus</math>||\oplus<br />
|-<br />
|<math>\ominus</math>||\ominus||<math>\otimes</math>||\otimes||<math>\circ</math>||\circ<br />
|-<br />
|<math>\bullet</math>||\bullet||<math>\diamond</math>||\diamond||<math>\lhd</math>||\lhd<br />
|-<br />
|<math>\rhd</math>||\rhd||<math>\unlhd</math>||\unlhd||[[Image:Unrhd.gif]]||\unrhd<br />
|-<br />
|<math>\oslash</math>||\oslash||<math>\odot</math>||\odot||<math>\bigcirc</math>||\bigcirc<br />
|-<br />
|<math>\triangleleft</math>||\triangleleft||<math>\Diamond</math>||\Diamond||<math>\bigtriangleup</math>||\bigtriangleup<br />
|-<br />
|<math>\bigtriangledown</math>||\bigtriangledown||<math>\Box</math>||\Box||<math>\triangleright</math>||\triangleright<br />
|-<br />
|<math>\setminus</math>||\setminus||<math>\wr</math>||\wr||<math>\sqrt{x}</math>||\sqrt{x}<br />
|-<br />
|<math>x^{\circ}</math>||x^{\circ}||<math>\triangledown</math>||\triangledown||<math>\sqrt[n]{x}</math>||\sqrt[n]{x}<br />
|-<br />
|<math>a^x</math>||a^x||<math>a^{xyz}</math>||a^{xyz}<br />
|}<br />
<br />
==Relations==<br />
{| class="latextable"<br />
!Symbol !! Command !!Symbol !! Command!!Symbol !! Command<br />
|-<br />
| <math>\le</math>||\le||<math>\ge</math>||\ge||<math>\neq</math>||\neq<br />
|-<br />
| <math>\sim</math>||\sim||<math>\ll</math>||\ll||<math>\gg</math>||\gg<br />
|-<br />
| <math>\doteq</math>||\doteq||<math>\simeq</math>||\simeq||<math>\subset</math>||\subset<br />
|-<br />
| <math>\supset</math>||\supset||<math>\approx</math>||\approx||<math>\asymp</math>||\asymp<br />
|-<br />
| <math>\subseteq</math>||\subseteq||<math>\supseteq</math>||\supseteq||<math>\cong</math>||\cong<br />
|-<br />
| <math>\smile</math>||\smile||<math>\sqsubset</math>||\sqsubset||<math>\sqsupset</math>||\sqsupset<br />
|-<br />
| <math>\equiv</math>||\equiv||<math>\frown</math>||\frown||<math>\sqsubseteq</math>||\sqsubseteq<br />
|-<br />
| <math>\sqsupseteq</math>||\sqsupseteq||<math>\propto</math>||\propto||<math>\bowtie</math>||\bowtie<br />
|-<br />
| <math>\in</math>||\in||<math>\ni</math>||\ni||<math>\prec</math>||\prec<br />
|-<br />
| <math>\succ</math>||\succ||<math>\vdash</math>||\vdash||<math>\dashv</math>||\dashv<br />
|-<br />
| <math>\preceq</math>||\preceq||<math>\succeq</math>||\succeq||<math>\models</math>||\models<br />
|-<br />
| <math>\perp</math>||\perp||<math>\parallel</math>||\parallel|| <math>\|</math> |<math>\gg</math>||\gg<br />
|-<br />
| <math>\mid</math>||\mid||<math>\bumpeq</math>||\bumpeq||<math>\ll</math>||\ll<br />
|}<br />
Negations of many of these relations can be formed by just putting \not before the symbol, or by slipping an n between the \ and the word. Here are a few examples, plus a few other negations; it works for many of the others as well.<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\nmid</math>||\nmid||<math>\nleq</math>||\nleq||<math>\ngeq</math>||\ngeq<br />
|-<br />
| <math>\nsim</math>||\nsim||<math>\ncong</math>||\ncong||<math>\nparallel</math>||\nparallel<br />
|-<br />
| <math>\not<</math>||\not<||<math>\not></math>||\not>||<math>\not=</math>||\not=<br />
|-<br />
| <math>\not\le</math>||\not\le||<math>\not\ge</math>||\not\ge||<math>\not\sim</math>||\not\sim<br />
|-<br />
|<math>\not \approx</math>||\not\approx||<math>\not\cong</math>||\not\cong||<math>\not\equiv</math>||\not\equiv<br />
|-<br />
| <math>\not\parallel</math>||\not\parallel||<math>\nless</math>||\nless||<math>\ngtr</math>||\ngtr<br />
|-<br />
| <math>\lneq</math>||\lneq||<math>\gneq</math>||\gneq||<math>\lnsim</math>||\lnsim<br />
|-<br />
| <math>\lneqq</math>||\lneqq||<math>\gneqq</math>||\gneqq<br />
|}<br />
<br />
To use other relations not listed here, such as =, >, and <, in LaTeX, you may just use the symbols on your keyboard.<br />
<br />
==Greek Letters==<br />
{| class="latextable"<br />
|+ Lowercase Letters<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\alpha</math>||\alpha||<math>\beta</math>||\beta||<math>\gamma</math>||\gamma||<math>\delta</math>||\delta<br />
|-<br />
| <math>\epsilon</math>||\epsilon||<math>\varepsilon</math>||\varepsilon||<math>\zeta</math>||\zeta||<math>\eta</math>||\eta<br />
|-<br />
| <math>\theta</math>||\theta||<math>\vartheta</math>||\vartheta||<math>\iota</math>||\iota||<math>\kappa</math>||\kappa<br />
|-<br />
| <math>\lambda</math>||\lambda||<math>\mu</math>||\mu||<math>\nu</math>||\nu||<math>\xi</math>||\xi<br />
|-<br />
|<math>\pi</math>||\pi||<math>\varpi</math>||\varpi||<math>\rho</math>||\rho||<math>\varrho</math>||\varrho<br />
|-<br />
| <math>\sigma</math>||\sigma||<math>\varsigma</math>||\varsigma||<math>\tau</math>||\tau||<math>\upsilon</math>||\upsilon<br />
|-<br />
| <math>\phi</math>||\phi||<math>\varphi</math>||\varphi||<math>\chi</math>||\chi||<math>\psi</math>||\psi<br />
|-<br />
| <math>\omega</math>||\omega<br />
|}<br />
<br />
<br />
{| class="latextable"<br />
|+ Capital Letters<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\Gamma</math>||\Gamma||<math>\Delta</math>||\Delta||<math>\Theta</math>||\Theta||<math>\Lambda</math>||\Lambda<br />
|-<br />
| <math>\Xi</math>||\Xi||<math>\Pi</math>||\Pi||<math>\Sigma</math>||\Sigma||<math>\Upsilon</math>||\Upsilon<br />
|-<br />
| <math>\Phi</math>||\Phi||<math>\Psi</math>||\Psi||<math>\Omega</math>||\Omega<br />
|}<br />
<br />
<br />
== Headline text ==<br />
==Arrows==<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\gets</math>||\gets||<math>\to</math>||\to<br />
|-<br />
|<math>\leftarrow</math>||\leftarrow||<math>\Leftarrow</math>||\Leftarrow<br />
|-<br />
|<math>\rightarrow</math>||\rightarrow||<math>\Rightarrow</math>||\Rightarrow<br />
|-<br />
|<math>\leftrightarrow</math>||\leftrightarrow||<math>\Leftrightarrow</math>||\Leftrightarrow<br />
|-<br />
|<math>\mapsto</math>||\mapsto||<math>\hookleftarrow</math>||\hookleftarrow<br />
|-<br />
|<math>\leftharpoonup</math>||\leftharpoonup||<math>\leftharpoondown</math>||\leftharpoondown<br />
|-<br />
|<math>\rightleftharpoons</math>||\rightleftharpoons||<math>\longleftarrow</math>||\longleftarrow<br />
|-<br />
|<math>\Longleftarrow</math>||\Longleftarrow||<math>\longrightarrow</math>||\longrightarrow<br />
|-<br />
|<math>\Longrightarrow</math>||\Longrightarrow||<math>\longleftrightarrow</math>||\longleftrightarrow<br />
|-<br />
|<math>\Longleftrightarrow</math>||\Longleftrightarrow||<math>\longmapsto</math>||\longmapsto<br />
|-<br />
|<math>\hookrightarrow</math>||\hookrightarrow||<math>\rightharpoonup</math>||\rightharpoonup<br />
|-<br />
|<math>\rightharpoondown</math>||\rightharpoondown||<math>\leadsto</math>||\leadsto<br />
|-<br />
|<math>\uparrow</math>||\uparrow||<math>\Uparrow</math>||\Uparrow<br />
|-<br />
|<math>\downarrow</math>||\downarrow||<math>\Downarrow</math>||\Downarrow<br />
|-<br />
|<math>\updownarrow</math>||\updownarrow||<math>\Updownarrow</math>||\Updownarrow<br />
|-<br />
|<math>\nearrow</math>||\nearrow||<math>\searrow</math>||\searrow<br />
|-<br />
|<math>\swarrow</math>||\swarrow||<math>\nwarrow</math>||\nwarrow<br />
|}<br />
(For those of you who hate typing long strings of letters, \iff and \implies can be used in place of \Longleftrightarrow and \Longrightarrow respectively.)<br />
<br />
==Dots==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|- <br />
|<math>\dots</math>||\dots||<br />
|-<br />
|<math>\cdots</math>||\cdots||<br />
|-<br />
|<math>\ddots</math>||\ddots||<br />
|-<br />
|<math>\iddots</math>||\iddots||<br />
|-<br />
|<math>\vdots</math>||\vdots||<br />
|}<br />
<br />
==Accents==<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\hat{x}</math>||\hat{x}||<math>\check{x}</math>||\check{x}||<math>\dot{x}</math>||\dot{x}<br />
|-<br />
|<math>\breve{x}</math>||\breve{x}||<math>\acute{x}</math>||\acute{x}||<math>\ddot{x}</math>||\ddot{x}<br />
|-<br />
|<math>\grave{x}</math>||\grave{x}||<math>\tilde{x}</math>||\tilde{x}||<math>\mathring{x}</math>||\mathring{x}<br />
|-<br />
|<math>\bar{x}</math>||\bar{x}||<math>\vec{x}</math>||\vec{x}<br />
|}<br />
When applying accents to i and j, you can use \imath and \jmath to keep the dots from interfering with the accents:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\vec{\jmath}</math>||\vec{\jmath}||<math>\tilde{\imath}</math>||\tilde{\imath}<br />
|}<br />
\tilde and \hat have wide versions that allow you to accent an expression:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\widehat{3+x}</math>||\widehat{3+x}||<math>\widetilde{abc}</math>||\widetilde{abc}<br />
|}<br />
<br />
==Others==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command <br />
|-<br />
|<math>\infty</math>||\infty||<math>\triangle</math>||\triangle||<math>\angle</math>||\angle<br />
|-<br />
|<math>\aleph</math>||\aleph||<math>\hbar</math>||\hbar||<math>\imath</math>||\imath<br />
|-<br />
|<math>\jmath</math>||\jmath||<math>\ell</math>||\ell||<math>\wp</math>||\wp<br />
|-<br />
|<math>\Re</math>||\Re||<math>\Im</math>||\Im||<math>\mho</math>||\mho<br />
|-<br />
|<math>\prime</math>||\prime||<math>\emptyset</math>||\emptyset||<math>\nabla</math>||\nabla<br />
|-<br />
|<math>\surd</math>||\surd||<math>\partial</math>||\partial||<math>\top</math>||\top<br />
|-<br />
|<math>\bot</math>||\bot||<math>\vdash</math>||\vdash||<math>\dashv</math>||\dashv<br />
|-<br />
|<math>\forall</math>||\forall||<math>\exists</math>||\exists||<math>\neg</math>||\neg<br />
|-<br />
|<math>\flat</math>||\flat||<math>\natural</math>||\natural||<math>\sharp</math>||\sharp<br />
|-<br />
|<math>\backslash</math>||\backslash||<math>\Box</math>||\Box||<math>\Diamond</math>||\Diamond<br />
|-<br />
|<math>\clubsuit</math>||\clubsuit||<math>\diamondsuit</math>||\diamondsuit||<math>\heartsuit</math>||\heartsuit<br />
|-<br />
|[[Image:Spadesuit.gif]]||\spadesuit||<math>\Join</math>||\Join||<math>\blacksquare</math>||\blacksquare<br />
|-<br />
|<math>\S</math>||\S||<math>\P</math>||\P||<math>\copyright</math>||\copyright<br />
|-<br />
|<math>\pounds</math>||\pounds||<math>\overarc{ABC}</math>||\overarc{ABC}(it works)||<math>\underarc{XYZ}</math>||\underarc{XYZ}(it works)<br />
|-<br />
|<math>\bigstar</math>||\bigstar||<br />
|-<br />
|<math>\square</math>||\square||<br />
|-<br />
|<math>\smiley</math>||\smiley||<br />
|-<br />
|<math>\mathbb{R}</math>||\mathbb{R}(all real numbers)||<br />
|-<br />
|<math>\checkmark</math>||\checkmark||<br />
|$<br />
|}<br />
<br />
==Command Symbols==<br />
Some symbols are used in commands so they need to be treated in a special way.<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>\textdollar</math>||\textdollar||<math>\&</math>||\&||<math>\%</math>||\%||<math>\#</math>||\#<br />
|-<br />
|<math>\_</math>||\_||<math>\{</math>||\{||<math>\}</math>||\}||<math>\backslash</math>||\backslash<br />
|}<br />
<br />
(Warning: Using <nowiki>$</nowiki> for <math>\textdollar</math> will result in <math>\$</math>. This is a bug as far as we know. Depending on the version of <math>\LaTeX</math> this is not always a problem.)<br />
<br />
==European Language Symbols==<br />
{| class="latextable"<br />
!Symbol!!Command!!Symbol!!Command!!Symbol!!Command!!Symbol!!Command<br />
|-<br />
|<math>{\oe}</math>||{\oe}||<math>{\ae}</math>||{\ae}||<math>{\o}</math>||{\o}<br />
|-<br />
|<math>{\OE}</math>||{\OE}||<math>{\AE}</math>||{\AE}||<math>{\AA}</math>||{\AA}||<math>{\O}</math>||{\O}<br />
|-<br />
|<math>{\l}</math>||{\l}||<math>{\ss}</math>||{\ss}||<math>\text{!`}</math>||!`<br />
|-<br />
|<math>{\L}</math>||{\L}||<math>{\SS}</math>||{\SS}||<br />
|}<br />
<br />
==Bracketing Symbols==<br />
In mathematics, sometimes we need to enclose expressions in brackets or braces or parentheses. Some of these work just as you'd imagine in LaTeX; type ( and ) for parentheses, [ and ] for brackets, and | and | for absolute value. However, other symbols have special commands:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\{</math>||\{||<math>\}</math>||\}||<math>\|</math>||<nowiki>\|</nowiki><br />
|-<br />
| <math>\backslash</math>||\backslash||<math>\lfloor</math>||\lfloor||<math>\rfloor</math>||\rfloor<br />
|-<br />
| <math>\lceil</math>||\lceil||<math>\rceil</math>||\rceil||<math>\langle</math>||\langle<br />
|-<br />
| <math>\rangle</math>||\rangle<br />
|}<br />
You might notice that if you use any of these to typeset an expression that is vertically large, like<br />
<br />
:<tt>(\frac{a}{x} )^2</tt><br />
<br />
the parentheses don't come out the right size:<br />
<br />
:<math>(\frac{a}{x})^2</math><br />
<br />
If we put \left and \right before the relevant parentheses, we get a prettier expression:<br />
<br />
:<tt>\left(\frac{a}{x} \right)^2</tt><br />
<br />
gives<br />
<br />
:<math>\left(\frac{a}{x} \right)^2</math><br />
<br />
\left and \right can also be used to resize the following symbols:<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\uparrow</math>||\uparrow||<math>\downarrow</math>||\downarrow||<math>\updownarrow</math>||\updownarrow<br />
|-<br />
| <math>\Uparrow</math>||\Uparrow||<math>\Downarrow</math>||\Downarrow||<math>\Updownarrow</math>||\Updownarrow<br />
|}<br />
<br />
==Multi-Size Symbols==<br />
Some symbols render differently in inline math mode and in display mode. Display mode occurs when you use <nowiki>\[...\]</nowiki> or <nowiki>$$...$$</nowiki>, or environments like \begin{equation}...\end{equation}, \begin{align}...\end{align}. Read more in the [[LaTeX:Commands|commands]] section of the guide about how symbols which take arguments above and below the symbols, such as a summation symbol, behave in the two modes.<br />
<br />
In each of the following, the two images show the symbol in display mode, then in inline mode.<br />
<br />
{| class="latextable"<br />
!Symbol !! Command!!Symbol !! Command!!Symbol !! Command<br />
|-<br />
|<math>\sum \textstyle\sum</math>||\sum||<math>\int \textstyle\int</math>||\int||<math>\oint \textstyle\oint</math>||\oint<br />
|-<br />
|<math>\prod \textstyle\prod</math>||\prod||<math>\coprod \textstyle\coprod</math>||\coprod||<math>\bigcap \textstyle\bigcap</math>||\bigcap<br />
|-<br />
|<math>\bigcup \textstyle\bigcup</math>||\bigcup||<math>\bigsqcup \textstyle\bigsqcup</math>||\bigsqcup||<math>\bigvee \textstyle\bigvee</math>||\bigvee<br />
|-<br />
|<math>\bigwedge \textstyle\bigwedge</math>||\bigwedge||<math>\bigodot \textstyle\bigodot</math>||\bigodot||<math>\bigotimes \textstyle\bigotimes</math>||\bigotimes<br />
|-<br />
|<math>\bigoplus \textstyle\bigoplus</math>||\bigoplus||<math>\biguplus \textstyle\biguplus</math>||\biguplus<br />
|}<br />
<br />
==See Also==<br />
*[[LaTeX:Commands | Next: Commands]]<br />
*[[LaTeX:Layout | Previous: Layout]]</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Moderators&diff=79151AoPS Moderators2016-07-03T02:55:14Z<p>Wlm2: </p>
<hr />
<div>A moderator on the Art of Problem Solving website is a non-administrator user who has powers for a particular forum which non-moderators don't. That is: they can lock topics in a forum, move them, delete them, comment about certain posts and so on. The short form for moderator is mod, the short term for administrator is admin.<br />
<br />
When a user is an Administrator, their name shows up in red.<br />
When they are a mod, their name shows up in green.<br />
<br />
==Moderators vs. Administrators==<br />
<br />
Administrators are more powerful in Art of Problem Solving than moderators. Moderators answer to Administrators, and not vice versa.<br />
<br />
Some admins might have their names in blue instead of red. Those are AoPS site administrators. They are administrators to all forums on AoPS, even private forums and class forums.<br />
<br />
==List of Moderators==<br />
<br />
Below is a list of all the current AoPS moderators:<br />
<br />
<br />
{{stub}}</div>Wlm2https://artofproblemsolving.com/wiki/index.php?title=AoPS_Wiki:Spam&diff=79150AoPS Wiki:Spam2016-07-03T02:45:33Z<p>Wlm2: /* Spam on the AoPS message boards */</p>
<hr />
<div>'''Spam''' is a message, post, or article that is, for the most part, irrelevant. Context is the best guide for relevance.<br />
<br />
<br />
==Spam on the AoPS message boards==<br />
Spam on the [http://www.artofproblemsolving.com/Forum/index.php?f=155 AoPS message boards] can usually be classified as one of two major types. The first type is advertising and the second is to raise one's post count or be annoying or unproductive. The first is grounds for an immediate ban from the message boards and will always be deleted when caught. The second is generally looked down upon, but the consequences are not so harsh.<br />
<br />
==Examples of Spam==<br />
<br />
Spam can include:<br />
<br />
*Repeating the same word / letter / phrase over and over<br />
*Stating something off topic<br />
*Going against [http://www.artofproblemsolving.com/Forum/ucp.php?mode=terms ToS] guidelines<br />
*Advertising<br />
*Using post extenders<br />
*A post deliberately meant to cause havoc (Trolling)<br />
<br />
==Spam on AoPSWiki==<br />
Spam on [[Main_Page|AoPSWiki]] is monitored much more closely than that on the AoPS message boards. Absolutely no spam is allowed! Examples of spam on AoPSWiki would be writing stuff that is irrelevant to a topic in that particular article, posting links to irrelevant websites, etc.<br />
<br />
However, the AoPSWiki is not opposed to relevant commercial links, so long as they are appropriately placed and topical.<br />
<br />
The following is always considered spam:<br />
* Links to websites that are collections of links and advertisements. Just link the most appropriate links where they belong in the [[Main_Page|AoPSWiki]].<br />
<br />
<br />
<br />
[[Category:AoPSWiki|Spam]]</div>Wlm2