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k a February Highlights and 2025 AoPS Online Class Information
jlacosta   0
Feb 2, 2025
We love to share what you can look forward to this month! The AIME I and AIME II competitions are happening on February 6th and 12th, respectively. Join our Math Jams the day after each competition where we will go over all the problems and the useful strategies to solve them!

2025 AIME I Math Jam: Difficulty Level: 8* (Advanced math)
February 7th (Friday), 4:30pm PT/7:30 pm ET

2025 AIME II Math Jam: Difficulty Level: 8* (Advanced math)
February 13th (Thursday), 4:30pm PT/7:30 pm ET

The F=ma exam will be held on February 12th. Check out our F=ma Problem Series course that begins February 19th if you are interested in participating next year! The course will prepare you to take the F=ma exam, the first test in a series of contests that determines the members of the US team for the International Physics Olympiad. You'll learn the classical mechanics needed for the F=ma exam as well as how to solve problems taken from past exams, strategies to succeed, and you’ll take a practice F=ma test of brand-new problems.

Mark your calendars for all our upcoming events:
[list][*]Feb 7, 4:30 pm PT/7:30pm ET, 2025 AIME I Math Jam
[*]Feb 12, 4pm PT/7pm ET, Mastering Language Arts Through Problem-Solving: The AoPS Method
[*]Feb 13, 4:30 pm PT/7:30pm ET, 2025 AIME II Math Jam
[*]Feb 20, 4pm PT/7pm ET, The Virtual Campus Spring Experience[/list]
AoPS Spring classes are open for enrollment. Get a jump on 2025 and enroll in our math, contest prep, coding, and science classes today! Need help finding the right plan for your goals? Check out our recommendations page!

Don’t forget: Highlight your AoPS Education on LinkedIn!
Many of you are beginning to build your education and achievements history on LinkedIn. Now, you can showcase your courses from Art of Problem Solving (AoPS) directly on your LinkedIn profile! Don't miss this opportunity to stand out and connect with fellow problem-solvers in the professional world and be sure to follow us at: https://www.linkedin.com/school/art-of-problem-solving/mycompany/ Check out our job postings, too, if you are interested in either full-time, part-time, or internship opportunities!

Our full course list for upcoming classes is below:
All classes run 7:30pm-8:45pm ET/4:30pm - 5:45pm PT unless otherwise noted.

Introductory: Grades 5-10

Prealgebra 1
Monday, Feb 3 - May 19
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Prealgebra 1 Self-Paced

Prealgebra 2
Sunday, Feb 16 - Jun 8
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Prealgebra 2 Self-Paced

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Introduction to Algebra B
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Introduction to Algebra B Self-Paced

Introduction to Geometry
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Intermediate: Grades 8-12

Intermediate Algebra
Wednesday, Feb 12 - Jul 23
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Intermediate Counting & Probability
Monday, Feb 10 - Jun 16
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Thursday, Feb 20 - May 8
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Precalculus
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Advanced: Grades 9-12

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Wednesday, Mar 5 - May 21

Calculus
Friday, Feb 28 - Aug 22
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Contest Preparation: Grades 6-12

MATHCOUNTS/AMC 8 Basics
Tuesday, Feb 4 - Apr 22
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Wednesday, Apr 16 - Jul 2

MATHCOUNTS/AMC 8 Advanced
Sunday, Feb 16 - May 4
Friday, Apr 11 - Jun 27

AMC 10 Problem Series
Sunday, Feb 9 - Apr 27
Tuesday, Mar 4 - May 20
Monday, Mar 31 - Jun 23

AMC 10 Final Fives
Sunday, Feb 9 - Mar 2 (3:30 - 5:00 pm ET/12:30 - 2:00 pm PT)

AMC 12 Problem Series
Sunday, Feb 23 - May 11

AMC 12 Final Fives
Sunday, Feb 9 - Mar 2 (3:30 - 5:00 pm ET/12:30 - 2:00 pm PT)

Special AIME Problem Seminar B
Sat & Sun, Feb 1 - Feb 2 (4:00 - 7:00 pm ET/1:00 - 4:00 pm PT)

F=ma Problem Series
Wednesday, Feb 19 - May 7

Programming

Introduction to Programming with Python
Sunday, Feb 16 - May 4
Monday, Mar 24 - Jun 16

Intermediate Programming with Python
Tuesday, Feb 25 - May 13

USACO Bronze Problem Series
Thursday, Feb 6 - Apr 24

Physics

Introduction to Physics
Friday, Feb 7 - Apr 25
Sunday, Mar 30 - Jun 22

Physics 1: Mechanics
Sunday, Feb 9 - Aug 3
Tuesday, Mar 25 - Sep 2

Relativity
Sat & Sun, Apr 26 - Apr 27 (4:00 - 7:00 pm ET/1:00 - 4:00pm PT)
0 replies
jlacosta
Feb 2, 2025
0 replies
k i Zero tolerance
ZetaX   49
N May 4, 2019 by NoDealsHere
Source: Use your common sense! (enough is enough)
Some users don't want to learn, some other simply ignore advises.
But please follow the following guideline:


To make it short: ALWAYS USE YOUR COMMON SENSE IF POSTING!
If you don't have common sense, don't post.


More specifically:

For new threads:


a) Good, meaningful title:
The title has to say what the problem is about in best way possible.
If that title occured already, it's definitely bad. And contest names aren't good either.
That's in fact a requirement for being able to search old problems.

Examples:
Bad titles:
- "Hard"/"Medium"/"Easy" (if you find it so cool how hard/easy it is, tell it in the post and use a title that tells us the problem)
- "Number Theory" (hey guy, guess why this forum's named that way¿ and is it the only such problem on earth¿)
- "Fibonacci" (there are millions of Fibonacci problems out there, all posted and named the same...)
- "Chinese TST 2003" (does this say anything about the problem¿)
Good titles:
- "On divisors of a³+2b³+4c³-6abc"
- "Number of solutions to x²+y²=6z²"
- "Fibonacci numbers are never squares"


b) Use search function:
Before posting a "new" problem spend at least two, better five, minutes to look if this problem was posted before. If it was, don't repost it. If you have anything important to say on topic, post it in one of the older threads.
If the thread is locked cause of this, use search function.

Update (by Amir Hossein). The best way to search for two keywords in AoPS is to input
[code]+"first keyword" +"second keyword"[/code]
so that any post containing both strings "first word" and "second form".


c) Good problem statement:
Some recent really bad post was:
[quote]$lim_{n\to 1}^{+\infty}\frac{1}{n}-lnn$[/quote]
It contains no question and no answer.
If you do this, too, you are on the best way to get your thread deleted. Write everything clearly, define where your variables come from (and define the "natural" numbers if used). Additionally read your post at least twice before submitting. After you sent it, read it again and use the Edit-Button if necessary to correct errors.


For answers to already existing threads:


d) Of any interest and with content:
Don't post things that are more trivial than completely obvious. For example, if the question is to solve $x^{3}+y^{3}=z^{3}$, do not answer with "$x=y=z=0$ is a solution" only. Either you post any kind of proof or at least something unexpected (like "$x=1337, y=481, z=42$ is the smallest solution). Someone that does not see that $x=y=z=0$ is a solution of the above without your post is completely wrong here, this is an IMO-level forum.
Similar, posting "I have solved this problem" but not posting anything else is not welcome; it even looks that you just want to show off what a genius you are.

e) Well written and checked answers:
Like c) for new threads, check your solutions at least twice for mistakes. And after sending, read it again and use the Edit-Button if necessary to correct errors.



To repeat it: ALWAYS USE YOUR COMMON SENSE IF POSTING!


Everything definitely out of range of common sense will be locked or deleted (exept for new users having less than about 42 posts, they are newbies and need/get some time to learn).

The above rules will be applied from next monday (5. march of 2007).
Feel free to discuss on this here.
49 replies
ZetaX
Feb 27, 2007
NoDealsHere
May 4, 2019
I need this. Pls help me
Giahuytls2326   12
N 5 minutes ago by Giahuytls2326
Source: Own
Given $\triangle ABC$ , orthocenter $H$, $E$ is the center of Euler's circle of $\triangle ABC$. $X,Y,Z$ is the midpoint of $AH,BH,CH$. From $X,Y,Z$ draw the tangent of $(E)$, cut a line through $E$ perpendicular to sides $BC, CA,AB$ at $M,N,P$ .Prove that $AM,BN,CP$ concurrent
12 replies
Giahuytls2326
Thursday at 4:59 PM
Giahuytls2326
5 minutes ago
Thanks u!
Ruji2018252   4
N 6 minutes ago by sqing
Let $a,b,c>0$ and $a+b+c=abc$
Find minimum (and prove)
\[P=(ab-1)(bc+1)^6(ca-1)\]
4 replies
Ruji2018252
Yesterday at 2:38 PM
sqing
6 minutes ago
Functional Equation
AnhQuang_67   4
N 6 minutes ago by gordian.knot
Find all functions $f:\mathbb{R} \to \mathbb{R}$ satisfying: $$x^2f(x)+f(1-x)=2x-x^4, \forall x \in \mathbb{R} $$
4 replies
AnhQuang_67
Yesterday at 4:02 PM
gordian.knot
6 minutes ago
thanks u!
Ruji2018252   1
N 26 minutes ago by sqing
Let $a,b,c\in \mathbb{R},a,b,c\ne 0$ and $a+b+c=0.$ Find minimum (and prove)
\[C=\dfrac{b^2+c^2-a^2}{b^2+c^2}+\dfrac{c^2+a^2-b^2}{c^2+a^2}+\dfrac{a^2+b^2-c^2}{a^2+b^2}\]
1 reply
1 viewing
Ruji2018252
3 hours ago
sqing
26 minutes ago
No more topics!
k i Zero tolerance
ZetaX   49
N May 4, 2019 by NoDealsHere
Source: Use your common sense! (enough is enough)
Some users don't want to learn, some other simply ignore advises.
But please follow the following guideline:


To make it short: ALWAYS USE YOUR COMMON SENSE IF POSTING!
If you don't have common sense, don't post.


More specifically:

For new threads:


a) Good, meaningful title:
The title has to say what the problem is about in best way possible.
If that title occured already, it's definitely bad. And contest names aren't good either.
That's in fact a requirement for being able to search old problems.

Examples:
Bad titles:
- "Hard"/"Medium"/"Easy" (if you find it so cool how hard/easy it is, tell it in the post and use a title that tells us the problem)
- "Number Theory" (hey guy, guess why this forum's named that way¿ and is it the only such problem on earth¿)
- "Fibonacci" (there are millions of Fibonacci problems out there, all posted and named the same...)
- "Chinese TST 2003" (does this say anything about the problem¿)
Good titles:
- "On divisors of a³+2b³+4c³-6abc"
- "Number of solutions to x²+y²=6z²"
- "Fibonacci numbers are never squares"


b) Use search function:
Before posting a "new" problem spend at least two, better five, minutes to look if this problem was posted before. If it was, don't repost it. If you have anything important to say on topic, post it in one of the older threads.
If the thread is locked cause of this, use search function.

Update (by Amir Hossein). The best way to search for two keywords in AoPS is to input
[code]+"first keyword" +"second keyword"[/code]
so that any post containing both strings "first word" and "second form".


c) Good problem statement:
Some recent really bad post was:
[quote]$lim_{n\to 1}^{+\infty}\frac{1}{n}-lnn$[/quote]
It contains no question and no answer.
If you do this, too, you are on the best way to get your thread deleted. Write everything clearly, define where your variables come from (and define the "natural" numbers if used). Additionally read your post at least twice before submitting. After you sent it, read it again and use the Edit-Button if necessary to correct errors.


For answers to already existing threads:


d) Of any interest and with content:
Don't post things that are more trivial than completely obvious. For example, if the question is to solve $x^{3}+y^{3}=z^{3}$, do not answer with "$x=y=z=0$ is a solution" only. Either you post any kind of proof or at least something unexpected (like "$x=1337, y=481, z=42$ is the smallest solution). Someone that does not see that $x=y=z=0$ is a solution of the above without your post is completely wrong here, this is an IMO-level forum.
Similar, posting "I have solved this problem" but not posting anything else is not welcome; it even looks that you just want to show off what a genius you are.

e) Well written and checked answers:
Like c) for new threads, check your solutions at least twice for mistakes. And after sending, read it again and use the Edit-Button if necessary to correct errors.



To repeat it: ALWAYS USE YOUR COMMON SENSE IF POSTING!


Everything definitely out of range of common sense will be locked or deleted (exept for new users having less than about 42 posts, they are newbies and need/get some time to learn).

The above rules will be applied from next monday (5. march of 2007).
Feel free to discuss on this here.
49 replies
ZetaX
Feb 27, 2007
NoDealsHere
May 4, 2019
Zero tolerance
G H J
G H BBookmark kLocked kLocked NReply
Source: Use your common sense! (enough is enough)
The post below has been deleted. Click to close.
This post has been deleted. Click here to see post.
ZetaX
7579 posts
#1 • 309 Y
Y by yrushi, Binomial-theorem, Mualpha7, amatysten, MiMi1376, Mathematicalx, shinny98NT, RadioActive, Pengu2005, Amir Hossein, Ankoganit, Wizard_32, adityaguharoy, jishu2003, Ultroid999OCPN, Supercali, k2005, abk2015, thecoolchicken, Axle, Ancy, MathCube1717, slhrnds, Rhiju, targo___, Snakes, niyu, someone8888-2, foxtrot3, JRBY, Aniv, samuel, GeronimoStilton, AlPhAtEx, Superguy, heron, Aspirant-to-IMO, Sarbajit10598, chem123, lkarhat, OliverA, integrated_JRC, nckim, PhysicsMonster_01, Bobbyakamurphy, DoingWhatCounts, AnArtist, fry8, microsoft_office_word, cowcow, MathPassionForever, hashtagmath, alex_g, speulers_theorem, GeneralCobra19, yangliardi, mathleticguyyy, mathdragon2000, Bill9000, Carpemath, usernameyourself, AlastorMoody, MathematicalUnicorn, vsamc, jjmath123, solver1104, BobsonJoe, HolyMath, Euler1728, JustKeepRunning, Toinfinity, Karsa, vedonidesimath, Combi1234, limopanda, RishiNandha_M, teomihai, electrovector, OlympiadIneqByBruteForce, middletonkids, amar_04, funmaths, kartik.v, aa1024, ooozeqes, sotpidot, MarkBcc168, StickyWashington, ghu2024, RC., TheCoolDinosuar, eflower2000, mathNart, gamerrk1004, Zorger74, LJCoder619, WizardMath, Purple_Planet, Aspiring_Mathletes, herbs_li, Atpar, Mathsolver19, CaptainLevi16, leibnitz, Kgxtixigct, tree_3, FatherOfIngenuity, geometry6, Mathelogical, CoolCarsOnTheRun, Aryan-23, mg60, b137740, magicarrow, NamePending, fjm30, Pi-rate, ApraTrip, hdrcure, OlympusHero, Rg230403, Euler01, super.shamik, Eliot, FencerRD, happyhippos, nomomon, LightningGirl, Supernova283, Joe__2020, poplintos, lc426, ihatemath123, Abidabi, mobro, Siddharth03, MathJams, ProblemSolver2048, centslordm, amazingxin777, v4913, pog, superagh, winterrain01, cryptographer, rg_ryse, etvat, chrono223, tenebrine, Jc426, hienprogamin1, MERC12345, HamstPan38825, vincentwant, VKU427, aops-g5-gethsemanea2, oVlad, lanadelmath, samrocksnature, Possible, son7, fuzimiao2013, FaThEr-SqUiRrEl, rayfish, Testking, eagles2018, Fordingle, ike.chen, jingwei325, suvamkonar, donotoven, Adventure10, megarnie, captainnobody, brickmaster8, jhu08, Robomania_534, Quidditch, andyloo666, bluelinfish, yjian, Sprites, hh99754539, nikolasxen, HWenslawski, IMUKAT, Flying-Man, Eat314, mod_x, asdf334, Bradygho, boing123, the_mathmagician, qwertyboyfromalotoftime, Han-Ji-Seung, pipitchaya.s4869, Sehraskar, Namodhar1908, polynomialian, RedFlame2112, arcsin2, Pranav1056, asimov, Lasitha_Jayasinghe, Mogmog8, ChromeRaptor777, rama1728, ImSh95, MathLion11, challengeitmath, lgkarras, linda197883, nihao4112, NTfish, NegativeZeroPlusOne, ehz2701, math_comb01, Ansh2020, discretemathcombinatorics, David-Vieta, sehgalsh, hrqdcj, evanhliu2009, Lamboreghini, TheMathCruncher_007, fishgirl, Aopamy, glroavpeh, adorefunctionalequation, nj100, EpicBird08, OronSH, math_sp, Flint_Steel, YOUsername, BDRSDG, GiantSlow, ultimate_life_form, dgkim, aidan0626, jeremy0519, Rainmaker2627, feliciaxu, sl_hc, jf123456, nguyenducmanh2705, Anchovy, IraeVid13, Mango247, Blue_banana4, ESAOPS, Sedro, lpieleanu, fura3334, Stormlight, DU4532, rty, J55406, eg4334, WiseTigerJ1, Exponent11, Yrock, m64sky, Mufara07, mathlover01347, Hello_Kitty, cannotbe, PrateekAtPrime, HoshimiyaMukuro, Kawhi2, pingpongmerrily, Yiyj1, Neilmarar2022, QueenArwen, booking, cubres, whwlqkd, and 32 other users
Some users don't want to learn, some other simply ignore advises.
But please follow the following guideline:


To make it short: ALWAYS USE YOUR COMMON SENSE IF POSTING!
If you don't have common sense, don't post.


More specifically:

For new threads:


a) Good, meaningful title:
The title has to say what the problem is about in best way possible.
If that title occured already, it's definitely bad. And contest names aren't good either.
That's in fact a requirement for being able to search old problems.

Examples:
Bad titles:
- "Hard"/"Medium"/"Easy" (if you find it so cool how hard/easy it is, tell it in the post and use a title that tells us the problem)
- "Number Theory" (hey guy, guess why this forum's named that way¿ and is it the only such problem on earth¿)
- "Fibonacci" (there are millions of Fibonacci problems out there, all posted and named the same...)
- "Chinese TST 2003" (does this say anything about the problem¿)
Good titles:
- "On divisors of a³+2b³+4c³-6abc"
- "Number of solutions to x²+y²=6z²"
- "Fibonacci numbers are never squares"


b) Use search function:
Before posting a "new" problem spend at least two, better five, minutes to look if this problem was posted before. If it was, don't repost it. If you have anything important to say on topic, post it in one of the older threads.
If the thread is locked cause of this, use search function.

Update (by Amir Hossein). The best way to search for two keywords in AoPS is to input
+"first keyword" +"second keyword"

so that any post containing both strings "first word" and "second form".


c) Good problem statement:
Some recent really bad post was:
Quote:
$lim_{n\to 1}^{+\infty}\frac{1}{n}-lnn$
It contains no question and no answer.
If you do this, too, you are on the best way to get your thread deleted. Write everything clearly, define where your variables come from (and define the "natural" numbers if used). Additionally read your post at least twice before submitting. After you sent it, read it again and use the Edit-Button if necessary to correct errors.


For answers to already existing threads:


d) Of any interest and with content:
Don't post things that are more trivial than completely obvious. For example, if the question is to solve $x^{3}+y^{3}=z^{3}$, do not answer with "$x=y=z=0$ is a solution" only. Either you post any kind of proof or at least something unexpected (like "$x=1337, y=481, z=42$ is the smallest solution). Someone that does not see that $x=y=z=0$ is a solution of the above without your post is completely wrong here, this is an IMO-level forum.
Similar, posting "I have solved this problem" but not posting anything else is not welcome; it even looks that you just want to show off what a genius you are.

e) Well written and checked answers:
Like c) for new threads, check your solutions at least twice for mistakes. And after sending, read it again and use the Edit-Button if necessary to correct errors.



To repeat it: ALWAYS USE YOUR COMMON SENSE IF POSTING!


Everything definitely out of range of common sense will be locked or deleted (exept for new users having less than about 42 posts, they are newbies and need/get some time to learn).

The above rules will be applied from next monday (5. march of 2007).
Feel free to discuss on this here.
This post has been edited 3 times. Last edited by jwelsh, Apr 1, 2020, 3:12 PM
Z Y
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Tiks
1144 posts
#2 • 55 Y
Y by adityaguharoy, foxtrot3, Aspirant-to-IMO, electrovector, led, hashtagmath, mathleticguyyy, Carpemath, OliverA, MathGenius_, Vasu090, RishiNandha_M, mathNart, Purple_Planet, theallpro1, franzliszt, OlympusHero, amazingxin777, pog, HamstPan38825, ChromeRaptor777, samrocksnature, judgefan99, suvamkonar, Adventure10, megarnie, jhu08, Quidditch, yjian, Eat314, Bradygho, MathLion11, mathking999, ImSh95, truehoward, nj100, ultimate_life_form, roribaki, EpicBird08, aidan0626, rirobaki, IraeVid13, Reakniseb, Mango247, ESAOPS, WilliamA, cubres, Lhaj3, and 7 other users
Huhhh... :roll: , ZetaX, I see you realy got angree :ninja:. Anyway, I can understand you; It is realy difficult to moderate a forum where there are,hmm...,27567 users :blush: .

I am in 100% agreement with you and I share your points. I think you should have done this long before(but better later than never :) ) and it is adviced to other moderators to undertake this kind of actions in other
sections too.

Thank you!
Z Y
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10000th User
3049 posts
#3 • 42 Y
Y by integrated_JRC, mathleticguyyy, mathdragon2000, Carpemath, Awesome555, kartik.v, mathNart, Purple_Planet, NamePending, OlympusHero, amazingxin777, pog, HamstPan38825, ChromeRaptor777, samrocksnature, centslordm, suvamkonar, jhu08, megarnie, yjian, Bradygho, mathking999, FateGrandOrder, ImSh95, MathLion11, the_mathmagician, ca981, sabkx, ultimate_life_form, Harote, aidan0626, IraeVid13, Adventure10, ESAOPS, kiyoras_2001, cubres, and 6 other users
Kudos to ZetaX. These guidelines, and many more, should have been enforced a long time ago and not just here in NT forum, but ALL other forums ought to follow as well (except maybe G&FF and Test forums). Common sense can be difficult to be defined for certain 'individuals' as they have 'common sense' defined differently.

Some BAD habits seen in some posts that resembles to the ones below:

No self-control: I must post something!!! I must reply! I'm very talkative!

Gibberish: "Yes I solved it hahaha!" "This problem is so easy that it is only for donkeys :roll: :P "

Expressing own feelings that no one really cares: "I got it right and my friends didn't" "What tha heck I didn't get perfect score in AMC!"

Useless answer replies: "is it 420?"

Faulty/no LaTeX used: $cosx=\frac1$

Abundant use of chat/1337 speak: lol omg wtf |-|4><0r5

Repetitive solutions: someone solved the problem and I am posting my solution too, I don't care if it's the same!

Lack of use of hide tags: *scratches head* I dunno how to use 'hide' (dunno=don't know)

And much much more annoying and stupid things I have seen in AoPS/ML.
Z Y
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ZetaX
7579 posts
#4 • 26 Y
Y by Carpemath, mathNart, Purple_Planet, rf20008, pog, samrocksnature, son7, suvamkonar, Adventure10, megarnie, jhu08, Scooby07, yjian, Bradygho, ImSh95, Mango247, ESAOPS, Kawhi2, cubres, and 7 other users
I added that contest names aren't good either as titles.
Z Y
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SpongeBob
188 posts
#5 • 15 Y
Y by mathNart, Purple_Planet, baenanabread, pog, samrocksnature, suvamkonar, Adventure10, megarnie, jhu08, yjian, ImSh95, Mango247, ESAOPS, cubres, and 1 other user
I always wanted to ask this, and I don't know why I have waited so long... How to use search function????
You can't type latex code if you want to search for some expresion, and if you are looking for same problem in 90% cases, text, beside expresion codes, are useles. Is there some way for using this for which I don't know, because, I get very upset when I see locked post, and message use search function, but I can't find problem like that.

For example this: http://www.mathlinks.ro/Forum/viewtopic.php?p=741742#741742

Can you show how to find this problem.
Tnx

Bye

P.S. If this is not the place for this kind of message, pls delete it, or I will, but pls, answer it...

EDIT: I am sorry I didn't mention this at first, I also support this kind of mesurements for making people to use their common sense, this should be used in other forums too, I can't put up with titles like "hard", and all that in sake of mora functional search function :)
This post has been edited 2 times. Last edited by SpongeBob, Mar 11, 2007, 11:15 PM
Z Y
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mathmanman
1444 posts
#6 • 9 Y
Y by pog, samrocksnature, Adventure10, megarnie, jhu08, yjian, ImSh95, Mango247, cubres
The keywords "phi positive integers" allow to find it quite quickly, restricting the search to the Number Theory subforum.

Also, I just wanted to say that I strongly agree with ZetaX's decision.
Z Y
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Hawk Tiger
667 posts
#7 • 9 Y
Y by pog, samrocksnature, megarnie, jhu08, yjian, ImSh95, sabkx, Adventure10, cubres
I agree with you ,ZetaX.But sometimes I don't have many words to show my YOUR COMMON SENSE ,because my English is not good. :blush:
I'll try to do better.
I also find that The search function seldom works.........
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Altheman
6194 posts
#8 • 25 Y
Y by biomathematics, mathleticguyyy, Purple_Planet, Greenleaf5002, OlympusHero, pog, OliverA, samrocksnature, suvamkonar, Adventure10, megarnie, jhu08, yjian, gauss202, snap7822, ImSh95, arfekete, Dansman2838, cubres, and 6 other users
@10000th User:

I disagree with the idea of no repeat solutions. I post solutions for problems because it is instructive for me to write out the proof and to get commentary from other users.
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darij grinberg
6555 posts
#9 • 25 Y
Y by mathleticguyyy, Carpemath, Greenleaf5002, Purple_Planet, Inconsistent, Zorger74, pog, samrocksnature, suvamkonar, jhu08, yjian, megarnie, snap7822, ImSh95, nj100, Dansman2838, Adventure10, Mango247, cubres, and 6 other users
Altheman wrote:
@10000th User:

I disagree with the idea of no repeat solutions. I post solutions for problems because it is instructive for me to write out the proof and to get commentary from other users.

I think he was referring to the lower fores, where solutions often happen to be merely computations etc. Here in the advanced section, it is always ok to post solutions, even if they happen to be equivalent to solutions already posted (it can always happen that the new post is easier to understand than the older one, and there are other reasons as well). It is also ok to post hints if no solutions were posted. But if someone posted a complete proof of an inequality using Cauchy-Schwarz, then it is not ok anymore to post the one-liner "Cauchy-Schwarz pwns it".

darij
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hinhhoc273
33 posts
#10 • 9 Y
Y by pog, samrocksnature, Adventure10, jhu08, yjian, megarnie, ImSh95, Mango247, cubres
But no ones explain 'what is common sense' ?
Thank you for your ideas. I'll try correct my mistakes.
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Stephen
402 posts
#11 • 10 Y
Y by Gumnaami_1945, pog, samrocksnature, jhu08, yjian, megarnie, ImSh95, Adventure10, Mango247, cubres
hinhhoc273 wrote:
But no ones explain 'what is common sense' ?
Thank you for your ideas. I'll try correct my mistakes.

Your common sense is your natural ability to make good judgements and to behave in a pratical and sensible way.
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Stephen
402 posts
#12 • 9 Y
Y by pog, samrocksnature, jhu08, yjian, megarnie, ImSh95, Adventure10, Mango247, cubres
Zetax, a fully agree with you. I'll be good in this site! :lol:
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aspava
53 posts
#13 • 15 Y
Y by mathleticguyyy, Purple_Planet, pog, samrocksnature, Lcz, jhu08, megarnie, ImSh95, Adventure10, Kawhi2, cubres, and 4 other users
interesting
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mastermindh
40 posts
#14 • 9 Y
Y by pog, samrocksnature, jhu08, megarnie, ImSh95, Adventure10, Mango247, Kawhi2, cubres
Is this allowed to post a solution which is faulty, or the one who posts is not able to recognize whether his solution is complete or not???
Like those who are new to this IMO LEVEL MATHS?
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darij grinberg
6555 posts
#15 • 11 Y
Y by Amir Hossein, OliverA, Purple_Planet, pog, samrocksnature, jhu08, megarnie, ImSh95, Adventure10, cubres, and 1 other user
Of course it is allowed. Sometimes we can actually learn from others' mistakes. But you should post the solution in a way that people can understand it and see whether it is right or wrong. This is what this whole topic is about. Unfortunately, many people here tend to answer topics with one-sentence posts like "the problem is easy using modulo arithmetic", and whenever somebody points out to them that such a posting is completely useless, they flame him for not having understood their ingenious one-sentence solution. As ZetaX writes, use your common sense. Nobody requires you to double-check every solution you write, but you should make sure it is readable.
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