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Contests & Programs AMC and other contests, summer programs, etc.
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Contests & Programs AMC and other contests, summer programs, etc.
AMC and other contests, summer programs, etc.
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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]
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.

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0 replies
jlacosta
May 1, 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 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
Recommend number theory books
MoonlightNT   7
N 31 minutes ago by Yiyj
I’m preparing AIME and USA(J)MO.
Can you recommend specifically Number theory books?
I already had intro NT of AOSP.
Thank you
7 replies
MoonlightNT
Yesterday at 1:50 PM
Yiyj
31 minutes ago
Mustang Math Recruitment is Open!
MustangMathTournament   10
N an hour ago by AnonLearner
The Interest Form for joining Mustang Math is open!

Hello all!

We're Mustang Math, and we are currently recruiting for the 2025-2026 year! If you are a high school or college student and are passionate about promoting an interest in competition math to younger students, you should strongly consider filling out the following form: https://link.mustangmath.com/join. Every member in MM truly has the potential to make a huge impact, no matter your experience!

About Mustang Math

Mustang Math is a nonprofit organization of high school and college volunteers that is dedicated to providing middle schoolers access to challenging, interesting, fun, and collaborative math competitions and resources. Having reached over 4000 U.S. competitors and 1150 international competitors in our first six years, we are excited to expand our team to offer our events to even more mathematically inclined students.

PROJECTS
We have worked on various math-related projects. Our annual team math competition, Mustang Math Tournament (MMT) recently ran. We hosted 8 in-person competitions based in Washington, NorCal, SoCal, Illinois, Georgia, Massachusetts, Nevada and New Jersey, as well as an online competition run nationally. In total, we had almost 900 competitors, and the students had glowing reviews of the event. MMT International will once again be running later in August, and with it, we anticipate our contest to reach over a thousand students.

In our classes, we teach students math in fun and engaging math lessons and help them discover the beauty of mathematics. Our aspiring tech team is working on a variety of unique projects like our website and custom test platform. We also have a newsletter, which, combined with our social media presence, helps to keep the mathematics community engaged with cool puzzles, tidbits, and information about the math world! Our design team ensures all our merch and material is aesthetically pleasing.

Some highlights of this past year include 1000+ students in our classes, AMC10 mock with 150+ participants, our monthly newsletter to a subscriber base of 6000+, creating 8 designs for 800 pieces of physical merchandise, as well as improving our custom website (mustangmath.com, 20k visits) and test-taking platform (comp.mt, 6500+ users).

Why Join Mustang Math?

As a non-profit organization on the rise, there are numerous opportunities for volunteers to share ideas and suggest projects that they are interested in. Through our organizational structure, members who are committed have the opportunity to become a part of the leadership team. Overall, working in the Mustang Math team is both a fun and fulfilling experience where volunteers are able to pursue their passion all while learning how to take initiative and work with peers. We welcome everyone interested in joining!

More Information

To learn more, visit https://link.mustangmath.com/RecruitmentInfo. If you have any questions or concerns, please email us at contact@mustangmath.com.

https://link.mustangmath.com/join
10 replies
2 viewing
MustangMathTournament
May 24, 2025
AnonLearner
an hour ago
Is there a good solution?
sadwinter   3
N an hour ago by sadwinter
:maybe: :love: :love:
3 replies
sadwinter
Yesterday at 9:47 AM
sadwinter
an hour ago
geo equals ForeBoding For Dennis
dchenmathcounts   98
N 2 hours ago by happypi31415
Source: USAJMO 2020/4
Let $ABCD$ be a convex quadrilateral inscribed in a circle and satisfying $DA < AB = BC < CD$. Points $E$ and $F$ are chosen on sides $CD$ and $AB$ such that $BE \perp AC$ and $EF \parallel BC$. Prove that $FB = FD$.

Milan Haiman
98 replies
dchenmathcounts
Jun 21, 2020
happypi31415
2 hours ago
IMO Shortlist 2014 N2
hajimbrak   33
N 2 hours ago by Maximilian113
Determine all pairs $(x, y)$ of positive integers such that \[\sqrt[3]{7x^2-13xy+7y^2}=|x-y|+1.\]
Proposed by Titu Andreescu, USA
33 replies
hajimbrak
Jul 11, 2015
Maximilian113
2 hours ago
Beautiful geo but i cant solve this
phonghatemath   1
N 2 hours ago by Diamond-jumper76
Source: homework
Given triangle $ABC$ inscribed in $(O)$. Two points $D, E$ lie on $BC$ such that $AD, AE$ are isogonal in $\widehat{BAC}$. $M$ is the midpoint of $AE$. $K$ lies on $DM$ such that $OK \bot AE$. $AD$ intersects $(O)$ at $P$. Prove that the line through $K$ parallel to $OP$ passes through the Euler center of triangle $ABC$.

Sorry for my English!
1 reply
phonghatemath
Yesterday at 4:48 PM
Diamond-jumper76
2 hours ago
Numbers on cards (again!)
popcorn1   79
N 2 hours ago by ezpotd
Source: IMO 2021 P1
Let $n \geqslant 100$ be an integer. Ivan writes the numbers $n, n+1, \ldots, 2 n$ each on different cards. He then shuffles these $n+1$ cards, and divides them into two piles. Prove that at least one of the piles contains two cards such that the sum of their numbers is a perfect square.
79 replies
popcorn1
Jul 20, 2021
ezpotd
2 hours ago
prove that at least one of them is divisible by some other member of the set.
Martin.s   1
N 2 hours ago by Diamond-jumper76
Given \( n + 1 \) integers \( a_1, a_2, \ldots, a_{n+1} \), each less than or equal to \( 2n \), prove that at least one of them is divisible by some other member of the set.
1 reply
Martin.s
Yesterday at 7:03 PM
Diamond-jumper76
2 hours ago
interesting incenter/tangent circle config
LeYohan   1
N 2 hours ago by Diamond-jumper76
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.
1 reply
LeYohan
Yesterday at 8:29 PM
Diamond-jumper76
2 hours ago
Channel name changed
Plane_geometry_youtuber   1
N 2 hours ago by ektorasmiliotis
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!
1 reply
Plane_geometry_youtuber
5 hours ago
ektorasmiliotis
2 hours ago
Integral ratio of divisors to divisors 1 mod 3 of 10n
cjquines0   20
N 2 hours ago by ezpotd
Source: 2016 IMO Shortlist N2
Let $\tau(n)$ be the number of positive divisors of $n$. Let $\tau_1(n)$ be the number of positive divisors of $n$ which have remainders $1$ when divided by $3$. Find all positive integral values of the fraction $\frac{\tau(10n)}{\tau_1(10n)}$.
20 replies
cjquines0
Jul 19, 2017
ezpotd
2 hours ago
4th grader qual JMO
HCM2001   52
N 2 hours ago by jb2015007
i mean.. whattttt??? just found out about this.. is he on aops? (i'm sure he is) where are you orz lol..
https://www.mathschool.com/blog/results/celebrating-success-douglas-zhang-is-rsm-s-youngest-usajmo-qualifier
52 replies
HCM2001
May 22, 2025
jb2015007
2 hours ago
Kids in clubs
atdaotlohbh   1
N 2 hours ago by Diamond-jumper76
There are $6k-3$ kids in a class. Is it true that for all positive integers $k$ it is possible to create several clubs each with 3 kids such that any pair of kids are both present in exactly one club?
1 reply
atdaotlohbh
Yesterday at 7:24 PM
Diamond-jumper76
2 hours ago
parallel wanted, right triangle, circumcircle, angle bisector related
parmenides51   6
N 3 hours ago by Ianis
Source: Norwegian Mathematical Olympiad 2020 - Abel Competition p4b
The triangle $ABC$ has a right angle at $A$. The centre of the circumcircle is called $O$, and the base point of the normal from $O$ to $AC$ is called $D$. The point $E$ lies on $AO$ with $AE = AD$. The angle bisector of $\angle CAO$ meets $CE$ in $Q$. The lines $BE$ and $OQ$ intersect in $F$. Show that the lines $CF$ and $OE$ are parallel.
6 replies
parmenides51
Apr 26, 2020
Ianis
3 hours ago
MOP Emails
hellohannah   120
N Apr 22, 2025 by GrantStar
So mop emails are probably coming tomorrow, feel free to discuss here. I'll probably post when I hear that they're out unless I'm asleep
120 replies
hellohannah
Apr 21, 2025
GrantStar
Apr 22, 2025
MOP Emails
G H J
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LearnMath_105
155 posts
#118
Y by
medals come out soon (4 days last year) after MOP emails
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mulberrykid
141 posts
#119
Y by
I heard metals will be posted before MOP emails for this year.
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mulberrykid
141 posts
#120
Y by
imagien_bad wrote:
mulberrykid wrote:
Can somebody call MAA and ask when metals will come out?

you call them

i have no phone
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pingpongmerrily
3846 posts
#121
Y by
mulberrykid wrote:
I heard metals will be posted before MOP emails for this year.

*medals
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Alex-131
5398 posts
#122
Y by
pingpongmerrily wrote:
mulberrykid wrote:
I heard metals will be posted before MOP emails for this year.

*medals

no he meant metals from the international precious metals institute.
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hashbrown2009
193 posts
#123 • 3 Y
Y by falliinqsnow-, megarnie, scannose
MAA will mail out a block of gold, silver, bronze, and a piece of stone labeled "Honorable Mention" for USAMO
for USAJMO they give out platinum labeled "Top Honors", Osmium labeled "Honors", and copper labeled "Honorable Mention"

New feature for MAA, metals


see
This post has been edited 1 time. Last edited by hashbrown2009, Apr 22, 2025, 4:17 PM
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imagien_bad
62 posts
#124 • 1 Y
Y by KevinYang2.71
i am go ing in sane
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Martin2001
170 posts
#125
Y by
guys it's probably gonna come later in afternoon but please check for me :omighty:
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vincentwant
1448 posts
#130
Y by
ethan2011 wrote:
Orthogonal. wrote:
hashbrown2009 wrote:
Any moment now Im waiting for MOP email

Hi waiting for MOP email, im dad-bot.

hi going to college next year, im dad-bot.

people from austin math circle seeing this (neuron activation):
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Ryan2010
368 posts
#131
Y by
Martin2001 wrote:
guys it's probably gonna come later in afternoon but please check for me :omighty:

nah maa emailed me and said its gona come out in 2 months
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hashbrown2009
193 posts
#132
Y by
According to this post: https://artofproblemsolving.com/community/c5h3553913_usajmo_scores_will_be_released_today
USA(J)MO scores are coming out today and awards/medals next week
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imagien_bad
62 posts
#133 • 2 Y
Y by elasticwealth, vincentwant
guys check you portals i got a thing for jmo scores but next to no score :sus:
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elasticwealth
342 posts
#134
Y by
imagien_bad wrote:
guys check you portals i got a thing for jmo scores but next to no score :sus:

I thought this was a troll. However, after checking, I confirm this is true.
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ethan2011
354 posts
#135
Y by
KevinYang2.71 wrote:
Emails are out.
Can you confirm
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GrantStar
821 posts
#136
Y by
GrantStar wrote:

this is incorrect, i think that document is out of date or something

Confirmed to be June 11 - July 2
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