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k a May Highlights and 2025 AoPS Online Class Information
jlacosta   0
May 1, 2025
May is an exciting month! National MATHCOUNTS is the second week of May in Washington D.C. and our Founder, Richard Rusczyk will be presenting a seminar, Preparing Strong Math Students for College and Careers, on May 11th.

Are you interested in working towards MATHCOUNTS and don’t know where to start? We have you covered! If you have taken Prealgebra, then you are ready for MATHCOUNTS/AMC 8 Basics. Already aiming for State or National MATHCOUNTS and harder AMC 8 problems? Then our MATHCOUNTS/AMC 8 Advanced course is for you.

Summer camps are starting next month at the Virtual Campus in math and language arts that are 2 - to 4 - weeks in duration. Spaces are still available - don’t miss your chance to have an enriching summer experience. There are middle and high school competition math camps as well as Math Beasts camps that review key topics coupled with fun explorations covering areas such as graph theory (Math Beasts Camp 6), cryptography (Math Beasts Camp 7-8), and topology (Math Beasts Camp 8-9)!

Be sure to mark your calendars for the following upcoming events:
[list][*]May 9th, 4:30pm PT/7:30pm ET, Casework 2: Overwhelming Evidence — A Text Adventure, a game where participants will work together to navigate the map, solve puzzles, and win! All are welcome.
[*]May 19th, 4:30pm PT/7:30pm ET, What's Next After Beast Academy?, designed for students finishing Beast Academy and ready for Prealgebra 1.
[*]May 20th, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 1 Math Jam, Problems 1 to 4, join the Canada/USA Mathcamp staff for this exciting Math Jam, where they discuss solutions to Problems 1 to 4 of the 2025 Mathcamp Qualifying Quiz!
[*]May 21st, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 2 Math Jam, Problems 5 and 6, Canada/USA Mathcamp staff will discuss solutions to Problems 5 and 6 of the 2025 Mathcamp Qualifying Quiz![/list]
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0 replies
jlacosta
May 1, 2025
0 replies
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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
J
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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
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Upvotes Farming
tintin21   24
N 5 minutes ago by Craftybutterfly
HOW DOES THIS WORK???
24 replies
tintin21
Saturday at 3:10 AM
Craftybutterfly
5 minutes ago
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PAGE NOT SCROLLING DOWN ALL THE WAY; GETS STUCK 1.5 POSTS BEFORE THREAD END
CurlyFalcon55   0
an hour ago
Summary of the problem:
Whenever I push the big, top right "Reply" button– NOT THE SMALL LITTLE "QUICK REPLY" BAR ON THE BOTTOM, and reply, I can't scroll down all the way to the bottom of the thread that I just posted in. Sometimes, very rarely though, I doesn't scroll down all the way when I push the "Quick Reply" bar.


-----Page URL:
Anywhere in the "Introduction to Number Theory" forum in AoPS


-----Steps to reproduce:

1. Go to the link above.

2. Click any thread or create a new one.

3. Click the "Reply" button, not the quick reply bar.

4. Type a reply.

5. Push the "Submit" button.

6. Try to scroll down. if you’re lucky, the problem will reproduce.

-----Expected behavior:
To scroll all the way down.


-----Frequency:
Almost every time I push the big "Reply" button, sometimes (but rarely) when I push the "Quick Reply" bar.


-----Operating system(s):
macOS Sequoia 15.4.1


-----Browser(s), including version:
Chrome, (I don't know what version)


-----Additional information:
-It rarely does it in the "Quick Reply" bar.
-It almost always does it in the big "Reply" button on the top right.


-----Can anyone reproduce?
0 replies
CurlyFalcon55
an hour ago
0 replies
J
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Post Times are Wrong
CurlyFalcon55   4
N 2 hours ago by CurlyFalcon55
Summary of the problem:
Every time a new post is posted, instead of the time it was posted at, it says "in 41 minutes" or "in an hour" or something like that. I was wondering, is that normal? I happens pretty regularly, though not all the time.

Page URL: Anywhere in the "Introduction to Number Theory" forum in AoPS

Steps to reproduce:
1.Go to the link above.
2.a.Click on any thread or b.just create a new thread.
3.If a., and if someone just posted, the bug might reproduce, and if you post, the problem might reproduce.
If b., then post something, and you might be lucky to see it reproduce.

Expected behavior:
Show the time it's been posted.

Frequency:
Pretty often.

Operating system:
macOS Sequoia 15.4.1

Browsers, including version:
Chrome, (I don't know what version)

Additional information:
This is hard to catch. It just sneaks up on you.

Does anyone else have the same problem? :help:
4 replies
CurlyFalcon55
2 hours ago
CurlyFalcon55
2 hours ago
J
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[Discord Invite] MathMinds United
TaPeoN   6
N 2 hours ago by Yiyj
Hi AoPS friends!

I’m thrilled to share MathMinds United, a server for everyone who loves math—whether you’re in grades 6–12, prepping for contests, or just enjoy a good puzzle. If you need homework help, want to tackle fun problems, or simply hang out with fellow math enthusiasts, you’ll fit right in!

• Weekly Problems
A brand-new challenge posts every Monday. We drop hints on Thursday, and reveal full solutions on Sunday—plenty of time to think it through (or team up with friends)!

• Mathy Bot
Our friendly AI tutor “Mathy” is always on standby. Ask for quick problem hints, step-by-step checks, or random math facts whenever you get stuck.

• Homework Help Channel
Post your work (text or images), and fellow members will guide you step by step. We love seeing your thought process—show your work, and we’ll help you grow!

• Special Events
– MathBlitz: A 30-minute, 5-problem sprint to test your speed and skills.
– Puzzle Night: Team-based challenges with rotating themes (number theory, combinatorics, geometry).

• Resource Hub
We’ve pinned collections of free AoPS textbooks, JVideo lectures, interactive GeoGebra applets, and hand-picked problem sets. Everything you need to learn and practice!

• Daily Math Spotlight
Each day, we highlight a neat theorem, proof sketch, or contest trick—perfect for a quick dose of inspiration or discussion.

Ready to join the fun and make new math friends?

For more info, PM me!

We can’t wait to see you in MathMinds United—help us shape the community!

— TaPeoN (Founder, MathMinds United)
6 replies
TaPeoN
Saturday at 9:19 PM
Yiyj
2 hours ago
J
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The reflection of AD intersect (ABC) lies on (AEF)
alifenix-   62
N 2 hours ago by Rayvhs
Source: USA TST for EGMO 2020, Problem 4
Let $ABC$ be a triangle. Distinct points $D$, $E$, $F$ lie on sides $BC$, $AC$, and $AB$, respectively, such that quadrilaterals $ABDE$ and $ACDF$ are cyclic. Line $AD$ meets the circumcircle of $\triangle ABC$ again at $P$. Let $Q$ denote the reflection of $P$ across $BC$. Show that $Q$ lies on the circumcircle of $\triangle AEF$.

Proposed by Ankan Bhattacharya
62 replies
alifenix-
Jan 27, 2020
Rayvhs
2 hours ago
J
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PAMO 2022 Problem 1 - Line Tangent to Circle Through Orthocenter
DylanN   5
N 2 hours ago by Y77
Source: 2022 Pan-African Mathematics Olympiad Problem 1
Let $ABC$ be a triangle with $\angle ABC \neq 90^\circ$, and $AB$ its shortest side. Let $H$ be the orthocenter of $ABC$. Let $\Gamma$ be the circle with center $B$ and radius $BA$. Let $D$ be the second point where the line $CA$ meets $\Gamma$. Let $E$ be the second point where $\Gamma$ meets the circumcircle of the triangle $BCD$. Let $F$ be the intersection point of the lines $DE$ and $BH$.

Prove that the line $BD$ is tangent to the circumcircle of the triangle $DFH$.
5 replies
DylanN
Jun 25, 2022
Y77
2 hours ago
J
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Conditional geo with centroid
a_507_bc   6
N 3 hours ago by LeYohan
Source: Singapore Open MO Round 2 2023 P1
In a scalene triangle $ABC$ with centroid $G$ and circumcircle $\omega$ centred at $O$, the extension of $AG$ meets $\omega$ at $M$; lines $AB$ and $CM$ intersect at $P$; and lines $AC$ and $BM$ intersect at $Q$. Suppose the circumcentre $S$ of the triangle $APQ$ lies on $\omega$ and $A, O, S$ are collinear. Prove that $\angle AGO = 90^{o}$.
6 replies
a_507_bc
Jul 1, 2023
LeYohan
3 hours ago
J
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Channel name changed
Plane_geometry_youtuber   0
3 hours ago
Hi,

Due to the search handle issue in youtube. My channel is renamed to Olympiad Geometry Club. And the new link is as following:

https://www.youtube.com/@OlympiadGeometryClub

Recently I introduced the concept of harmonic bundle. I will move on to the conjugate median soon. In the future, I will discuss more than a thousand theorems on plane geometry and hopefully it can help to the students preparing for the Olympiad competition.

Please share this to the people may need it.

Thank you!
0 replies
Plane_geometry_youtuber
3 hours ago
0 replies
J
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IMO Shortlist 2010 - Problem G1
Amir Hossein   134
N 3 hours ago by happypi31415
Let $ABC$ be an acute triangle with $D, E, F$ the feet of the altitudes lying on $BC, CA, AB$ respectively. One of the intersection points of the line $EF$ and the circumcircle is $P.$ The lines $BP$ and $DF$ meet at point $Q.$ Prove that $AP = AQ.$

Proposed by Christopher Bradley, United Kingdom
134 replies
Amir Hossein
Jul 17, 2011
happypi31415
3 hours ago
J
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interesting incenter/tangent circle config
LeYohan   0
4 hours ago
Source: 2022 St. Mary's Canossian College F4 Final Exam Mathematics Paper 1, Q 18d of 18 (modified)
$BC$ is tangent to the circle $AFDE$ at $D$. $AB$ and $AC$ cut the circle at $F$ and $E$ respectively. $I$ is the in-centre of $\triangle ABC$, and $D$ is on the line $AI$. $CI$ and $DE$ intersect at $G$, while $BI$ and $FD$ intersect at $P$. Prove that the points $P, F, G, E$ lie on a circle.
0 replies
LeYohan
4 hours ago
0 replies
J
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interesting geo config (2/3)
Royal_mhyasd   5
N 4 hours ago by Royal_mhyasd
Source: own
Let $\triangle ABC$ be an acute triangle and $H$ its orthocenter. Let $P$ be a point on the parallel through $A$ to $BC$ such that $\angle APH = |\angle ABC-\angle ACB|$. Define $Q$ and $R$ as points on the parallels through $B$ to $AC$ and through $C$ to $AB$ similarly. If $P,Q,R$ are positioned around the sides of $\triangle ABC$ as in the given configuration, prove that $P,Q,R$ are collinear.
5 replies
Royal_mhyasd
Saturday at 11:36 PM
Royal_mhyasd
4 hours ago
J
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interesting geometry config (3/3)
Royal_mhyasd   2
N 4 hours ago by Royal_mhyasd
Let $\triangle ABC$ be an acute triangle, $H$ its orthocenter and $E$ the center of its nine point circle. Let $P$ be a point on the parallel through $C$ to $AB$ such that $\angle CPH = |\angle BAC-\angle ABC|$ and $P$ and $A$ are on different sides of $BC$ and $Q$ a point on the parallel through $B$ to $AC$ such that $\angle BQH = |\angle BAC - \angle ACB|$ and $C$ and $Q$ are on different sides of $AB$. If $B'$ and $C'$ are the reflections of $H$ over $AC$ and $AB$ respectively, $S$ and $T$ are the intersections of $B'Q$ and $C'P$ respectively with the circumcircle of $\triangle ABC$, prove that the intersection of lines $CT$ and $BS$ lies on $HE$.

final problem for this "points on parallels forming strange angles with the orthocenter" config, for now. personally i think its pretty cool :D
2 replies
Royal_mhyasd
Yesterday at 7:06 AM
Royal_mhyasd
4 hours ago
J
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Convex Quadrilateral with Bisector Diagonal
matinyousefi   8
N 5 hours ago by lpieleanu
Source: Germany TST 2017
In a convex quadrilateral $ABCD$, $BD$ is the angle bisector of $\angle{ABC}$. The circumcircle of $ABC$ intersects $CD,AD$ in $P,Q$ respectively and the line through $D$ parallel to $AC$ cuts $AB,AC$ in $R,S$ respectively. Prove that point $P,Q,R,S$ lie on a circle.
8 replies
matinyousefi
Apr 11, 2020
lpieleanu
5 hours ago
J
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collinear wanted, toucpoints of incircle related
parmenides51   2
N 5 hours ago by Tamam
Source: 2018 Thailand October Camp 1.2
Let $\Omega$ be the inscribed circle of a triangle $\vartriangle ABC$. Let $D, E$ and $F$ be the tangency points of $\Omega$ and the sides $BC, CA$ and $AB$, respectively, and let $AD, BE$ and $CF$ intersect $\Omega$ at $K, L$ and $M$, respectively, such that $D, E, F, K, L$ and $M$ are all distinct. The tangent line of $\Omega$ at $K$ intersects $EF$ at $X$, the tangent line of $\Omega$ at $L$ intersects $DE$ at $Y$ , and the tangent line of $\Omega$ at M intersects $DF$ at $Z$. Prove that $X,Y$ and $Z$ are collinear.
2 replies
parmenides51
Oct 15, 2020
Tamam
5 hours ago
J
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J
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changed URLs - is there a way to find very old topics?
spanferkel   2
N Mar 30, 2024 by Demetri
Hi,
I haven't visited this site for many years and see that the URLs have completely changed. If it was before
https://artofproblemsolving.com/Forum/viewtopic.php?p=2471680#p2471680
now it looks like
https://artofproblemsolving.com/community/c6h105686.
Sadly, the links in old posts haven't been updated. How to recover them?
E.g. I'd like to find the two threads quoted in #4 here:

https://artofproblemsolving.com/community/c6h46202p493480
The search function doesn't help, or can it?
Thanks in advance!
2 replies
spanferkel
Mar 30, 2024
Demetri
Mar 30, 2024
J
changed URLs - is there a way to find very old topics?
G H J
Reveal topic tags
search
function
L
G H BBookmark kLocked kLocked NReply
The post below has been deleted. Click to close.
This post has been deleted. Click here to see post.
spanferkel
1585 posts
spanferkel
#1 h  Mar 30, 2024, 9:23 PM • 1 Y
Y by AlienGirl05
Hi,
I haven't visited this site for many years and see that the URLs have completely changed. If it was before
https://artofproblemsolving.com/Forum/viewtopic.php?p=2471680#p2471680
now it looks like
https://artofproblemsolving.com/community/c6h105686.
Sadly, the links in old posts haven't been updated. How to recover them?
E.g. I'd like to find the two threads quoted in #4 here:

https://artofproblemsolving.com/community/c6h46202p493480
The search function doesn't help, or can it?
Thanks in advance!
This post has been edited 1 time. Last edited by spanferkel, Mar 30, 2024, 9:24 PM
Reason: typo
Z K Y
The post below has been deleted. Click to close.
This post has been deleted. Click here to see post.
aidan0626
1965 posts
aidan0626
#2 h  Mar 30, 2024, 9:38 PM
Y by
spanferkel wrote:
Hi,
I haven't visited this site for many years and see that the URLs have completely changed. If it was before
https://artofproblemsolving.com/Forum/viewtopic.php?p=2471680#p2471680
now it looks like
https://artofproblemsolving.com/community/c6h105686.
Sadly, the links in old posts haven't been updated. How to recover them?
E.g. I'd like to find the two threads quoted in #4 here:

https://artofproblemsolving.com/community/c6h46202p493480
The search function doesn't help, or can it?
Thanks in advance!
the first link is this
i don't know about the second link tho
Z K Y
The post below has been deleted. Click to close.
This post has been deleted. Click here to see post.
Demetri
1424 posts
Demetri
#3 h  Mar 30, 2024, 9:38 PM
Y by
This has been reported before.
For more information visit this link:
https://artofproblemsolving.com/community/q1h2954840p26462050
Use search function to look for errors before reporting. :)
EDIT: After looking more closely the I have no idea how to get the second link though.
This post has been edited 1 time. Last edited by Demetri, Mar 30, 2024, 9:39 PM
Z K Y
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