User contributions
- 06:46, 5 January 2014 (diff | hist) . . (+4) . . m 2000 AMC 12 Problems/Problem 15 (→Solution)
- 07:22, 11 December 2013 (diff | hist) . . (+4) . . m 1951 AHSME Problems/Problem 26 (→Solution)
- 07:12, 11 December 2013 (diff | hist) . . (+183) . . 1962 AHSME Problems/Problem 8
- 06:00, 5 December 2013 (diff | hist) . . (+8) . . m 1983 AIME Problems/Problem 10
- 06:08, 7 November 2013 (diff | hist) . . (+132) . . User:DANCH (current)
- 06:05, 7 November 2013 (diff | hist) . . (+133) . . Deficient number
- 05:58, 7 November 2013 (diff | hist) . . (+160) . . 2006 IMO Problems
- 04:10, 7 November 2013 (diff | hist) . . (+28) . . User:DANCH
- 06:50, 28 October 2013 (diff | hist) . . (+82) . . IMO Shortlist Problems
- 06:48, 28 October 2013 (diff | hist) . . (+504) . . N 2011 IMO Shortlist Problems/G8 (Created page with "Let <math>ABC</math> be an acute triangle with circumcircle <math>\Gamma</math>. Let <math>\ell</math> be a tangent line to <math>\Gamma</math>, and let <math>\ell_a, \ell_b</mat...") (current)
- 06:48, 28 October 2013 (diff | hist) . . (+400) . . N 2011 IMO Shortlist Problems/N5 (Created page with "Let <math>f</math> be a function from the set of integers to the set of positive integers. Suppose that, for any two integers <math>m</math> and <math>n</math>, the difference <m...") (current)
- 06:47, 28 October 2013 (diff | hist) . . (+533) . . N 2011 IMO Shortlist Problems/C1 (Created page with "Let <math>n > 0</math> be an integer. We are given a balance and <math>n</math> weights of weight <math>2^0,2^1, \cdots ,2^{n-1}</math>. We are to place each of the <math>n</mat...") (current)
- 06:46, 28 October 2013 (diff | hist) . . (+284) . . N 2011 IMO Shortlist Problems/A6 (Created page with "Let <math>f: \mathbb R \to \mathbb R</math> be a real-valued function defined on the set of real numbers that satisfies <cmath> f(x + y) \le yf(x) + f(f(x)) </cmath> for all real...") (current)
- 06:44, 28 October 2013 (diff | hist) . . (+889) . . N 2011 IMO Shortlist Problems/C3 (Created page with "Let <math>\mathcal{S}</math> be a finite set of at least two points in the plane. Assume that no three points of <math>\mathcal S</math> are collinear. A ''windmill'' is a proces...") (current)
- 06:44, 28 October 2013 (diff | hist) . . (+500) . . N 2011 IMO Shortlist Problems/A1 (Created page with "==Problem== Given any set <math>A = \{a_1, a_2, a_3, a_4\}</math> of four distinct positive integers, we denote the sum <math>a_1 +a_2 +a_3 +a_4</math> by <math>s_A</math>. Let <...") (current)
- 06:34, 28 October 2013 (diff | hist) . . (-1) . . 2000 AMC 12 Problems/Problem 12 (→Solution)
- 22:23, 25 October 2013 (diff | hist) . . (+22) . . Law of Tangents
- 22:17, 15 October 2013 (diff | hist) . . (+539) . . N 2006 SMT/General Problems/Problem 7 (Created page with "==Problem== An aircraft is equipped with three engines that operate independently. The probability of an engine failure is <math>.01</math>. What is the probability of a successf...") (current)
- 22:01, 15 October 2013 (diff | hist) . . (+427) . . N 2006 SMT/General Problems/Problem 5 (Created page with "==Problem== A geometric series is one where the ratio between each two consecutive terms is constant <math>(ex. 3, 6, 12, 24,\cdots)</math>. The fifth term of a geometric series ...") (current)
- 21:45, 15 October 2013 (diff | hist) . . (+607) . . N 2006 SMT/General Problems/Problem 3 (Created page with "==Problem== After a typist has written ten letters and had addressed the ten corresponding envelopes, a careless mailing clerk inserted the letters in the envelopes at random, on...") (current)
- 21:26, 15 October 2013 (diff | hist) . . (+706) . . N 2006 SMT/General Problems/Problem 2 (Created page with "==Problem== A customer enters a supermarket. The probability that the customer buys bread is <math>0.60</math>, the probability that the customer buys milk is <math>0.50</math>, ...") (current)
- 21:15, 15 October 2013 (diff | hist) . . (+427) . . N 2006 SMT/General Problems/Problem 1 (Created page with "==Problem== After a cyclist has gone <math>\frac{2}{3}</math> of his route, he gets a flat tire. Finishing on foot, he spends twice as long walking as he did riding. How many tim...") (current)
- 21:06, 14 October 2013 (diff | hist) . . (0) . . m 2002 USAMO Problems/Problem 5 (→Problem)
- 21:03, 14 October 2013 (diff | hist) . . (+124) . . N Even function (Created page with "An '''even function''' is one that satisfies <math>f(x)=f(-x)</math> ==See Also== *Function *Odd function {{stub}}")
- 21:01, 14 October 2013 (diff | hist) . . (+348) . . N Odd function (Created page with "An '''odd function''' <math>f</math> satisfies both <math>f(x)+f(-x)=0</math> and <math>-f(x)=f(-x)</math>. For instance, <math>f(x)=3</math> does not satisfy either, as <math>3...") (current)
- 21:00, 14 October 2013 (diff | hist) . . (+37) . . Function (→See also)
- 20:47, 14 October 2013 (diff | hist) . . (+154) . . Quaternion (current)
- 04:43, 14 October 2013 (diff | hist) . . (+79) . . 1966 IMO Problems/Problem 3
- 04:42, 14 October 2013 (diff | hist) . . (+79) . . 1966 IMO Problems/Problem 2
- 04:40, 14 October 2013 (diff | hist) . . (0) . . 1966 IMO Problems/Problem 1
- 04:40, 14 October 2013 (diff | hist) . . (+28) . . 1966 IMO Problems/Problem 1
- 04:38, 14 October 2013 (diff | hist) . . (+65) . . 1966 IMO Problems/Problem 1
- 04:34, 14 October 2013 (diff | hist) . . (+1) . . m 1966 IMO Problems (→Problem 1)
- 04:33, 14 October 2013 (diff | hist) . . (+60) . . 1966 IMO Problems
- 04:32, 14 October 2013 (diff | hist) . . (+9) . . m 1966 IMO (current)
- 04:20, 14 October 2013 (diff | hist) . . (+8) . . Proof by contradiction (→Euclid's proof of the infinitude of primes)
- 04:20, 14 October 2013 (diff | hist) . . (+8) . . Proof by contradiction (→Proof that the square root of 2 is irrational)
- 00:51, 14 October 2013 (diff | hist) . . (+34) . . m 2011 AMC 10A Problems/Problem 7
- 00:49, 14 October 2013 (diff | hist) . . (+91) . . m 1995 AHSME Problems/Problem 6 (→Solution) (current)
- 01:08, 12 October 2013 (diff | hist) . . (+20) . . m Singapore mathematics competitions
- 01:01, 12 October 2013 (diff | hist) . . (+141) . . m Singapore mathematics competitions
- 00:57, 12 October 2013 (diff | hist) . . (-87) . . Singapore mathematics competitions
- 00:48, 12 October 2013 (diff | hist) . . (+52) . . m Primary Mathematics World Contest (→See also)
- 00:45, 12 October 2013 (diff | hist) . . (+1,565) . . N 2013 PMWC (Created page with "== Problem I1 == Solution == Problem I2 == Solution == Problem I3 == [[2013 PMWC Problems/Problem I3|Solu...")
- 00:45, 12 October 2013 (diff | hist) . . (+1,565) . . N 2012 PMWC (Created page with "== Problem I1 == Solution == Problem I2 == Solution == Problem I3 == [[2012 PMWC Problems/Problem I3|Solu...")
- 00:44, 12 October 2013 (diff | hist) . . (+1,565) . . N 2011 PMWC (Created page with "== Problem I1 == Solution == Problem I2 == Solution == Problem I3 == [[2011 PMWC Problems/Problem I3|Solu...")
- 00:44, 12 October 2013 (diff | hist) . . (+1,565) . . N 2010 PMWC (Created page with "== Problem I1 == Solution == Problem I2 == Solution == Problem I3 == [[2010 PMWC Problems/Problem I3|Solu...")
- 00:43, 12 October 2013 (diff | hist) . . (+1,565) . . N 2009 PMWC (Created page with "== Problem I1 == Solution == Problem I2 == Solution == Problem I3 == [[2009 PMWC Problems/Problem I3|Solu...")
- 00:42, 12 October 2013 (diff | hist) . . (+1,565) . . N 2008 PMWC (Created page with "== Problem I1 == Solution == Problem I2 == Solution == Problem I3 == [[2008 PMWC Problems/Problem I3|Solu...")
- 00:41, 12 October 2013 (diff | hist) . . (+96) . . m PMWC Problems and Solutions (current)
- 05:19, 11 October 2013 (diff | hist) . . (-37) . . Gottfried Leibniz
- 05:19, 11 October 2013 (diff | hist) . . (+38) . . Gottfried Leibniz
- 04:50, 11 October 2013 (diff | hist) . . (+25) . . Solid (current)
- 04:45, 11 October 2013 (diff | hist) . . (-1) . . m Solid
- 04:44, 11 October 2013 (diff | hist) . . (+21) . . Solid
- 04:43, 11 October 2013 (diff | hist) . . (+7) . . m Solid
- 04:42, 11 October 2013 (diff | hist) . . (+216) . . N Solid (Created page with "Solids are 3D shapes. They may or may not have holes. They may or may not have curved edges. ''Examples'': *Cube *Sphere *Cylinder *Irregular icosahedron ''Non-examples'': *Squ...")
- 01:44, 11 October 2013 (diff | hist) . . (-2) . . 2013 IMO Problems/Problem 2
- 01:43, 11 October 2013 (diff | hist) . . (-18) . . 2013 IMO Problems/Problem 2
- 01:43, 11 October 2013 (diff | hist) . . (+754) . . N 2013 IMO Problems/Problem 2 (Created page with "==Problem== A confi�guration of <math>4027</math> points in the plane is called ''Colombian'' if it consists of <math>2013</math> red points and <math>2014</math> blue points, ...")
- 01:34, 11 October 2013 (diff | hist) . . (+346) . . N 2013 IMO Problems/Problem 1 (Created page with "==Problem== Prove that for any pair of positive integers <math>k</math> and <math>n</math>, there exist <math>k</math> positive integers <math>m_1,m_2,...,m_k</math> (not necessa...")
- 00:50, 11 October 2013 (diff | hist) . . (+633) . . N 2013 IMO (Created page with "'''2013 IMO''' problems and solutions. The first link contains the full set of test problems. The rest contain each individual problem and its solution. *[[2013 IMO Problems...")
- 00:47, 11 October 2013 (diff | hist) . . (+633) . . N 2012 IMO (Created page with "'''2012 IMO''' problems and solutions. The first link contains the full set of test problems. The rest contain each individual problem and its solution. *[[2012 IMO Problems...")
- 00:17, 11 October 2013 (diff | hist) . . (+64) . . 2011 IMO Problems/Problem 6
- 00:14, 11 October 2013 (diff | hist) . . (+37) . . 2011 IMO Problems/Problem 5
- 00:13, 11 October 2013 (diff | hist) . . (+21) . . m 2011 IMO Problems/Problem 5
- 00:10, 11 October 2013 (diff | hist) . . (+73) . . 2011 IMO Problems/Problem 2
- 00:05, 11 October 2013 (diff | hist) . . (+46) . . m 2011 IMO Problems/Problem 3
- 00:05, 11 October 2013 (diff | hist) . . (+27) . . m 2011 IMO Problems/Problem 3
- 00:02, 11 October 2013 (diff | hist) . . (+46) . . m 2012 IMO Problems/Problem 4
- 23:57, 10 October 2013 (diff | hist) . . (-4) . . m 2012 IMO Problems/Problem 4
- 22:56, 10 October 2013 (diff | hist) . . (-2) . . m Primitive Pythagorean Triple
- 22:44, 10 October 2013 (diff | hist) . . (+131) . . m Mass (→Units of Measure) (current)
- 22:38, 10 October 2013 (diff | hist) . . (+65) . . m 2005 PMWC Problems
- 22:37, 10 October 2013 (diff | hist) . . (+90) . . m 1998 PMWC
- 22:36, 10 October 2013 (diff | hist) . . (+90) . . m 1997 PMWC
- 06:46, 10 October 2013 (diff | hist) . . (+42) . . N User:DANCH (Created page with "Hi from DANCH (Da Awesome Non-Crazy Human)")
- 06:42, 10 October 2013 (diff | hist) . . (+70) . . m 1997 PMWC Problems/Problem I12 (→Problem)
- 06:37, 10 October 2013 (diff | hist) . . (+12) . . m 1997 PMWC Problems/Problem T10
- 06:24, 10 October 2013 (diff | hist) . . (+457) . . 1997 PMWC Problems/Problem T9 (I just improved the incomplete solution)
- 06:13, 10 October 2013 (diff | hist) . . (-183) . . 1997 PMWC Problems/Problem T9 (→Solution)
- 06:08, 10 October 2013 (diff | hist) . . (+375) . . N Greedy Algorithm (Created page with "A Greedy Algorithm is one that always chooses the best immediate option. The advantage is that it usually makes decisions simpler, but it may create problems in the long run. It ...")
- 06:03, 10 October 2013 (diff | hist) . . (+678) . . 1997 PMWC Problems/Problem T7 (→Solution)
- 05:28, 10 October 2013 (diff | hist) . . (-1) . . m 1997 PMWC Problems/Problem T4
- 05:27, 10 October 2013 (diff | hist) . . (-13) . . m 1997 PMWC Problems/Problem T4 (Mislabeled missing solution)
- 06:20, 9 October 2013 (diff | hist) . . (-174) . . m 2012 IMO Problems/Problem 5 (I don't know what this is. However, I wrote it up more formally.)