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k a March Highlights and 2025 AoPS Online Class Information

jlacosta 0

Mar 2, 2025

March is the month for State MATHCOUNTS competitions! Kudos to everyone who participated in their local chapter competitions and best of luck to all going to State! Join us on March 11th for a Math Jam devoted to our favorite Chapter competition problems! Are you interested in training for MATHCOUNTS? Be sure to check out our AMC 8/MATHCOUNTS Basics and Advanced courses.

Are you ready to level up with Olympiad training? Registration is open with early bird pricing available for our WOOT programs: MathWOOT (Levels 1 and 2), CodeWOOT, PhysicsWOOT, and ChemWOOT. What is WOOT? WOOT stands for Worldwide Online Olympiad Training and is a 7-month high school math Olympiad preparation and testing program that brings together many of the best students from around the world to learn Olympiad problem solving skills. Classes begin in September!

Do you have plans this summer? There are so many options to fit your schedule and goals whether attending a summer camp or taking online classes, it can be a great break from the routine of the school year. Check out our summer courses at AoPS Online, or if you want a math or language arts class that doesn’t have homework, but is an enriching summer experience, our AoPS Virtual Campus summer camps may be just the ticket! We are expanding our locations for our AoPS Academies across the country with 15 locations so far and new campuses opening in Saratoga CA, Johns Creek GA, and the Upper West Side NY. Check out this page for summer camp information.

Be sure to mark your calendars for the following events:
[list][*]March 5th (Wednesday), 4:30pm PT/7:30pm ET, HCSSiM Math Jam 2025. Amber Verser, Assistant Director of the Hampshire College Summer Studies in Mathematics, will host an information session about HCSSiM, a summer program for high school students.
[*]March 6th (Thursday), 4:00pm PT/7:00pm ET, Free Webinar on Math Competitions from elementary through high school. Join us for an enlightening session that demystifies the world of math competitions and helps you make informed decisions about your contest journey.
[*]March 11th (Tuesday), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS Chapter Discussion MATH JAM. AoPS instructors will discuss some of their favorite problems from the MATHCOUNTS Chapter Competition. All are welcome!
[*]March 13th (Thursday), 4:00pm PT/7:00pm ET, Free Webinar about Summer Camps at the Virtual Campus. Transform your summer into an unforgettable learning adventure! From elementary through high school, we offer dynamic summer camps featuring topics in mathematics, language arts, and competition preparation - all designed to fit your schedule and ignite your passion for learning.[/list]
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

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Mon, Tue, Wed & Thurs, Jun 23 - Jun 26 (meets every day of the week!)

0 replies

jlacosta

Mar 2, 2025

0 replies

k i Adding contests to the Contest Collections

dcouchman 1

N Apr 5, 2023 by v_Enhance

Want to help AoPS remain a valuable Olympiad resource? Help us add contests to AoPS's Contest Collections.

Find instructions and a list of contests to add here: https://artofproblemsolving.com/community/c40244h1064480_contests_to_add

1 reply

dcouchman

Sep 9, 2019

v_Enhance

Apr 5, 2023

k i Suggestion Form

jwelsh 0

May 6, 2021

Hello!

Given the number of suggestions we’ve been receiving, we’re transitioning to a suggestion form. If you have a suggestion for the AoPS website, please submit the Google Form:
Suggestion Form

To keep all new suggestions together, any new suggestion threads posted will be deleted.

Please remember that if you find a bug outside of FTW! (after refreshing to make sure it’s not a glitch), make sure you’re following the How to write a bug report instructions and using the proper format to report the bug.

Please check the FTW! thread for bugs and post any new ones in the For the Win! and Other Games Support Forum.

0 replies

jwelsh

May 6, 2021

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

China Mathematical Olympiad 1993 problem5

jred 3

N 35 minutes ago by iStud

Source: China Mathematical Olympiad 1993 problem5

$10$ students bought some books in a bookstore. It is known that every student bought exactly three kinds of books, and any two of them shared at least one kind of book. Determine, with proof, how many students bought the most popular book at least? (Note: the most popular book means most students bought this kind of book)

3 replies

jred

Sep 23, 2013

iStud

35 minutes ago

x and o game, in an infinite grid of regular triangles

parmenides51 5

N an hour ago by Lil_flip38

Source: Norwegian Mathematical Olympiad 2017 - Abel Competition p3b

In an infinite grid of regular triangles, Niels and Henrik are playing a game they made up.
Every other time, Niels picks a triangle and writes $\times$ in it, and every other time, Henrik picks a triangle where he writes a $o$ . If one of the players gets four in a row in some direction (see figure), he wins the game.
Determine whether one of the players can force a victory.
IMAGE

5 replies

parmenides51

Sep 3, 2019

Lil_flip38

an hour ago

k How to report tags

Craftybutterfly 6

N an hour ago by Demetri

Not sure if this belongs in site support but how do you report tags for topics? I recently noticed in one of the topics I made on site support had really weird tags.

6 replies

Craftybutterfly

Today at 3:30 AM

Demetri

an hour ago

BMN is equilateral iff rectangle ABCD is square

parmenides51 4

N an hour ago by Tsikaloudakis

Source: 2004 Romania NMO SL - Shortlist VII-VIII p8 https://artofproblemsolving.com/community/c3950157_

Consider a point $M$ on the diagonal $BD$ of a given rectangle $ABCD$ , such that $\angle AMC = \angle CMD$ . The point $N$ is the intersection point between $AM$ and the parallel line to $CM$ that contains $B$ . Prove that the triangle $BMN$ is equilateral if and only if $ABCD$ is a square.

Valentin Vornicu

4 replies

parmenides51

Sep 16, 2024

Tsikaloudakis

an hour ago

Loop of Logarithms

scls140511 10

N an hour ago by SomeonecoolLovesMaths

Source: 2024 China Round 1 (Gao Lian)

Round 1

1 Real number $m>1$ satisfies $\log_9 \log_8 m =2024$ . Find the value of $\log_3 \log_2 m$ .

10 replies

scls140511

Sep 8, 2024

SomeonecoolLovesMaths

an hour ago

Proving a kite

Bugi 4

N 2 hours ago by ali123456

Source: Serbian JBTST 3, Day 2

Let $ABCD$ be a convex quadrilateral, such that

$\angle CBD=2\cdot\angle ADB, \angle ABD=2\cdot\angle CDB$ and $AB=CB$ .

Prove that quadrilateral $ABCD$ is a kite.

4 replies

Bugi

May 31, 2009

ali123456

2 hours ago

Inequality

Marinchoo 6

N 2 hours ago by sqing

If $abc=1$ prove that $8(a^3+b^3+c^3) \geq 3(a^2+bc)(b^2+ac)(c^2+ab)$

6 replies

Marinchoo

Apr 28, 2020

sqing

2 hours ago

Interesting inequality

sqing 4

N 2 hours ago by sqing

Source: Own

Let $a,b,c\geq 2 .$ Prove that
$(a^2-1)(b-1)(c^2-1) -\frac{9}{4}abc\geq -9$ $(a^2-1)(b-1)(c^2-1) -\frac{11}{5}abc\geq -\frac{43}{5}$ $(a^2-1)(b-1)(c^2-1) -2abc\geq -7$ $(a-1)(b^2-1)(c-1) -\frac{3}{4}abc\geq -3$ $(a-1)(b^2-1)(c-1) -\frac{3}{5}abc\geq -\frac{9}{5}$ $(a-1)(b^2-1)(c-1) -\frac{1}{2}abc\geq -1$

4 replies

sqing

4 hours ago

sqing

2 hours ago

Orthocentre is collinear with two tangent points

vladimir92 42

N 2 hours ago by AshAuktober

Source: Chinese MO 1996

Let $\triangle{ABC}$ be a triangle with orthocentre $H$ . The tangent lines from $A$ to the circle with diameter $BC$ touch this circle at $P$ and $Q$ . Prove that $H,P$ and $Q$ are collinear.

42 replies

vladimir92

Jul 29, 2010

AshAuktober

2 hours ago

Problem 4

den_thewhitelion 3

N 2 hours ago by DensSv

Source: Second Romanian JBMO TST 2016

We have a 4x4 board.All 1x1 squares are white.A move is changing colours of all squares of a 1x3 rectangle from black to white and from white to black.It is possible to make all the 1x1 squares black after several moves?

3 replies

den_thewhitelion

Jun 15, 2016

DensSv

2 hours ago

Find the period

Anto0110 2

N 2 hours ago by YaoAOPS

Let $a_1, a_2, ..., a_k, ...$ be a sequence that consists of an initial block of $p$ positive distinct integers that then repeat periodically. This means that $\{a_1, a_2, \dots, a_p\}$ are $p$ distinct positive integers and $a_{n+p}=a_n$ for every positive integer $n$ . The terms of the sequence are not known and the goal is to find the period $p$ . To do this, at each move it possible to reveal the value of a term of the sequence at your choice.
If $p$ is one of the first $k$ prime numbers, find for which values of $k$ there exist a strategy that allows to find $p$ revealing at most $8$ terms of the sequence.

2 replies

Anto0110

Yesterday at 7:37 PM

YaoAOPS

2 hours ago

delete tag

o.k.oo 5

N Today at 4:27 AM by Zestra

The tag section for the question I shared is deleted after a while. What should not be done? Thanks.

5 replies

o.k.oo

Yesterday at 6:00 PM

Zestra

Today at 4:27 AM

Rating Up Not Occuring

CatsRule222 2

N Today at 2:29 AM by aidan0626

Bug: In the state round, I answered 10 questions correctly without the rating changing at all (rating 43 currently) in the other rounds, it always works.
URL: https://artofproblemsolving.com/mathcounts_trainer/play
How to Recreate:
1. Get to mathcounts trainer rating 43 on state round, and it will glitch.

2 replies

CatsRule222

Today at 2:09 AM

aidan0626

Today at 2:29 AM

k Pressing 'go down button' always creates a gray box on the last post

Craftybutterfly 18

N Yesterday at 8:31 PM by jlacosta

Summary of the problem: Pressing go down to last post button always creates a gray box overlapping last post
Page URL: any forum
Steps to reproduce:
1. Go to any topic in a forum
2. The gray box at the bottom overlaps part of the first post
Expected behavior: Should not show a gray box
Frequency: 100% of the time
Operating system(s): Linux HP EliteBook 835 G8 Notebook PC
Browser(s), including version: Chrome 133.0.6943.142 (Official Build) (64-bit) (cohort: Stable)
Additional information: It works on any other device, on my iPhone XR, a MacOS, and my iPad. Took the screenshot a month ago. The gray box still appears

18 replies

Craftybutterfly

Mar 12, 2025

jlacosta

Yesterday at 8:31 PM

Suggestion Form

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Reveal topic tags

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1291 posts

jwelsh

#1 h May 6, 2021, 6:02 PM • 141 Y

Y by etvat, csong, je100, vaporwave, Physicsisfun123, GCA, wamofan, brendan_cape, g1zq, Pi31, pith0n, happycow168, ad333, SparklyFlowers, krishgarg, CoolCarsOnTheRun, Supernova283, soloachiever, floof421, MERC12345, nicarmt, Zorger74, Spicysaurus, Onafets, rainbow2011, HamstPan38825, pragna0527, my-chick-chick, SciBoy2000, chengel, lakesiide, jacoporizzo, Taco12, Ailing8, awesomeguy856, RaymondZhu, MLiang2018, WyattB, MathNinja7, RoyalCactus, son7, suvamkonar, DofL, kavya.rajesh, OlympusHero, hdrcure, Jc426, mich7math, yao.c, Critical, duskstream, Testking, susielawsuit, TryhardMathlete, Adventure10, lovefractions, ksdicecream, captainnobody, OliverA, Eat314, SmartGroot, Countcountcount, JVAJVA, Pusheen25, Pi-rate, samrocksnature, Equinox8, Michaelthecool, happy_amy, Beta_, jhu08, Blueclay, whims, Possible, megarnie, skyss, T34, hh99754539, Ikeguy, HWenslawski, mahaler, AFTERMATH_15, cryptographer, fluff_E, the_mathmagician, MathLion11, LJCoder619, ObjectZ, bpan2021, alien04, brickmaster8, belindazhu13, ImSh95, Cygnet, b2025tyx, ilvyu2, squareroot12621, ARay10, challengeitmath, thumper12, hexafandra, mathmax12, Danielzh, EthanHL, AlienGirl05, Cokevending56, ultimate_life_form, BabaLama, Andrew2019, jmiao, UpvoteFarm, feliciaxu, thecuber, CatsMeow12, jf123456, tigeryong, banana_cream_PI, Mango247, Blue_banana4, WiseTigerJ1, ahxun2006, tennisbeast14, nikola_tesla-roadster, Spiritpalm, ujulee, LostInBali, Fryderyk_Chopin, A21, buddyram, Exponent11, NSAoPS, naba, Marcus_Zhang, Homegrown__Country__Girl, QueenArwen, CheckeredPenguin10, GodGodGodGodGoose, Yrock, Ben-the-Great, byl2048, AwesomeKittyCat

Hello!

Given the number of suggestions we’ve been receiving, we’re transitioning to a suggestion form. If you have a suggestion for the AoPS website, please submit the Google Form:
Suggestion Form

To keep all new suggestions together, any new suggestion threads posted will be deleted.

Please remember that if you find a bug outside of FTW! (after refreshing to make sure it’s not a glitch), make sure you’re following the How to write a bug report instructions and using the proper format to report the bug.

Please check the FTW! thread for bugs and post any new ones in the For the Win! and Other Games Support Forum.

This post has been edited 1 time. Last edited by jwelsh, Jan 17, 2022, 7:33 PM
Reason: updated

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