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k a April Highlights and 2025 AoPS Online Class Information
jlacosta   0
Apr 2, 2025
Spring is in full swing and summer is right around the corner, what are your plans? At AoPS Online our schedule has new classes starting now through July, so be sure to keep your skills sharp and be prepared for the Fall school year! Check out the schedule of upcoming classes below.

WOOT early bird pricing is in effect, don’t miss out! If you took MathWOOT Level 2 last year, no worries, it is all new problems this year! Our Worldwide Online Olympiad Training program is for high school level competitors. AoPS designed these courses to help our top students get the deep focus they need to succeed in their specific competition goals. Check out the details at this link for all our WOOT programs in math, computer science, chemistry, and physics.

Looking for summer camps in math and language arts? Be sure to check out the video-based summer camps offered at the Virtual Campus that are 2- to 4-weeks in duration. 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 events:
[list][*]April 3rd (Webinar), 4pm PT/7:00pm ET, Learning with AoPS: Perspectives from a Parent, Math Camp Instructor, and University Professor
[*]April 8th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS State Discussion
April 9th (Webinar), 4:00pm PT/7:00pm ET, Learn about Video-based Summer Camps at the Virtual Campus
[*]April 10th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MathILy and MathILy-Er Math Jam: Multibackwards Numbers
[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/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
Apr 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 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
MathPath
PatTheKing806   4
N 2 minutes ago by evt917
Is anybody else going to MathPath?

I haven't gotten in. its been 3+ weeks since they said my application was done.
4 replies
2 viewing
PatTheKing806
Mar 24, 2025
evt917
2 minutes ago
Discuss the Stanford Math Tournament Here
Aaronjudgeisgoat   252
N an hour ago by PEKKA
I believe discussion is allowed after yesterday at midnight, correct?
If so, I will put tentative answers on this thread.
By the way, does anyone know the answer to Geometry Problem 5? I was wondering if I got that one right
Also, if you put answers, please put it in a hide tag

Answers for the Algebra Subject Test
Estimated Algebra Cutoffs
Answers for the Geometry Subject Test
Estimated Geo Cutoffs
Answers for the Discrete Subject Test
Estimated Cutoffs for Discrete
Answers for the Team Round
Guts Answers
252 replies
Aaronjudgeisgoat
Apr 14, 2025
PEKKA
an hour ago
Advanced topics in Inequalities
va2010   9
N 2 hours ago by Strangett
So a while ago, I compiled some tricks on inequalities. You are welcome to post solutions below!
9 replies
va2010
Mar 7, 2015
Strangett
2 hours ago
24 Aug FE problem
nicky-glass   3
N 2 hours ago by pco
Source: Baltic Way 1995
$f:\mathbb R\setminus \{0\} \to \mathbb R$
(i) $f(1)=1$,
(ii) $\forall x,y,x+y \neq 0:f(\frac{1}{x+y})=f(\frac{1}{x})+f(\frac{1}{y}) : P(x,y)$
(iii) $\forall x,y,x+y \neq 0:(x+y)f(x+y)=xyf(x)f(y) :Q(x,y)$
$f=?$
3 replies
nicky-glass
Aug 24, 2016
pco
2 hours ago
Simply equation but hard
giangtruong13   1
N 2 hours ago by anduran
Find all integer pairs $(x,y)$ satisfy that: $$(x^2+y)(y^2+x)=(x-y)^3$$
1 reply
giangtruong13
3 hours ago
anduran
2 hours ago
NYMC High School Summer Program (HSSP)
missionsqhc   0
2 hours ago
I was recently accepted into the black level of New York Math Circle's High School Summer Program (HSSP). I would be taking this program as a prefrosh and wondering if anyone who has experience with this program could comment on it. It's my understanding that the program will heavily focus on problem solving and competitions rather than math research. In that case, would it offer any benefit to an incoming college math major?
0 replies
missionsqhc
2 hours ago
0 replies
Hard Polynomial Problem
MinhDucDangCHL2000   1
N 3 hours ago by Tung-CHL
Source: IDK
Let $P(x)$ be a polynomial with integer coefficients. Suppose there exist infinitely many integer pairs $(a,b)$ such that $P(a) + P(b) = 0$. Prove that the graph of $P(x)$ is symmetric about a point (i.e., it has a center of symmetry).
1 reply
MinhDucDangCHL2000
4 hours ago
Tung-CHL
3 hours ago
IMO LongList 1985 CYP2 - System of Simultaneous Equations
Amir Hossein   13
N 3 hours ago by cubres
Solve the system of simultaneous equations
\[\sqrt x - \frac 1y - 2w + 3z = 1,\]\[x + \frac{1}{y^2} - 4w^2 - 9z^2 = 3,\]\[x \sqrt x - \frac{1}{y^3} - 8w^3 + 27z^3 = -5,\]\[x^2 + \frac{1}{y^4} - 16w^4 - 81z^4 = 15.\]
13 replies
Amir Hossein
Sep 10, 2010
cubres
3 hours ago
Tennessee Math Tournament (TMT) Online 2025
TennesseeMathTournament   72
N 3 hours ago by Ruegerbyrd
Hello everyone! We are excited to announce a new competition, the Tennessee Math Tournament, created by the Tennessee Math Coalition! Anyone can participate in the virtual competition for free.

The testing window is from March 22nd to April 12th, 2025. Virtual competitors may participate in the competition at any time during that window.

The virtual competition consists of three rounds: Individual, Bullet, and Team. The Individual Round is 60 minutes long and consists of 30 questions (AMC 10 level). The Bullet Round is 20 minutes long and consists of 80 questions (Mathcounts Chapter level). The Team Round is 30 minutes long and consists of 16 questions (AMC 12 level). Virtual competitors may compete in teams of four, or choose to not participate in the team round.

To register and see more information, click here!

If you have any questions, please email connect@tnmathcoalition.org or reply to this thread!

Thank you to our lead sponsor, Jane Street!

IMAGE
72 replies
TennesseeMathTournament
Mar 9, 2025
Ruegerbyrd
3 hours ago
Centroid Distance Identity in Triangle
zeta1   5
N 3 hours ago by DottedCaculator
Let M be any point inside triangle ABC, and let G be the centroid of triangle ABC. Prove that:

\[
|MA|^2 + |MB|^2 + |MC|^2 = |GA|^2 + |GB|^2 + |GC|^2 + 3|MG|^2
\]
5 replies
zeta1
Today at 12:28 PM
DottedCaculator
3 hours ago
Numbers not power of 5
Kayak   34
N 3 hours ago by cursed_tangent1434
Source: Indian TST D1 P2
Show that there do not exist natural numbers $a_1, a_2, \dots, a_{2018}$ such that the numbers \[ (a_1)^{2018}+a_2, (a_2)^{2018}+a_3, \dots, (a_{2018})^{2018}+a_1 \]are all powers of $5$

Proposed by Tejaswi Navilarekallu
34 replies
Kayak
Jul 17, 2019
cursed_tangent1434
3 hours ago
Number Theory Chain!
JetFire008   58
N 3 hours ago by Primeniyazidayi
I will post a question and someone has to answer it. Then they have to post a question and someone else will answer it and so on. We can only post questions related to Number Theory and each problem should be more difficult than the previous. Let's start!

Question 1
58 replies
JetFire008
Apr 7, 2025
Primeniyazidayi
3 hours ago
Silly Sequences
whatshisbucket   25
N 3 hours ago by bin_sherlo
Source: ELMO 2018 #2, 2018 ELMO SL N3
Consider infinite sequences $a_1,a_2,\dots$ of positive integers satisfying $a_1=1$ and $$a_n \mid a_k+a_{k+1}+\dots+a_{k+n-1}$$for all positive integers $k$ and $n.$ For a given positive integer $m,$ find the maximum possible value of $a_{2m}.$

Proposed by Krit Boonsiriseth
25 replies
whatshisbucket
Jun 28, 2018
bin_sherlo
3 hours ago
Divisibility NT FE
CHESSR1DER   12
N 4 hours ago by internationalnick123456
Source: Own
Find all functions $f$ $N \rightarrow N$ such for any $a,b$:
$(a+b)|a^{f(b)} + b^{f(a)}$.
12 replies
CHESSR1DER
Monday at 7:07 PM
internationalnick123456
4 hours ago
2024 AIME I Problem Ranking
zhenghua   53
N Mar 29, 2025 by finevulture
Hi, what do you guys think the real order should've been. This is what I think:
1, 2, 3, 5, 4, 6, 11, 7, 9, 15, 8, 10, 13, 12, 14.
53 replies
zhenghua
Feb 3, 2024
finevulture
Mar 29, 2025
2024 AIME I Problem Ranking
G H J
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zhenghua
1064 posts
#1
Y by
Hi, what do you guys think the real order should've been. This is what I think:
1, 2, 3, 5, 4, 6, 11, 7, 9, 15, 8, 10, 13, 12, 14.
This post has been edited 1 time. Last edited by zhenghua, Feb 3, 2024, 12:36 AM
Reason: More clear
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happypi31415
742 posts
#2
Y by
8 should be much much earlier (tbh it shouldn't even be on the test)
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exp-ipi-1
1073 posts
#3
Y by
1, 2, 4, 3, 6, 5, 7, 11, 9, 8, 10, 15, 12, 13, 14
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zhenghua
1064 posts
#4
Y by
happypi31415 wrote:
8 should be much much earlier (tbh it shouldn't even be on the test)

I spent a whole hour or more trying to figure out this problem and I still couldn't figure it out. :(
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GP102
826 posts
#5
Y by
zhenghua wrote:
happypi31415 wrote:
8 should be much much earlier (tbh it shouldn't even be on the test)

I spent a whole hour or more trying to figure out this problem and I still couldn't figure it out. :(

Same, except I figured it out with 20 minutes to spare lol
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DreamineYT
281 posts
#6
Y by
2 was veryy eazy, as long as you know your formulas
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QuickMath
229 posts
#7
Y by
GP102 wrote:
zhenghua wrote:
happypi31415 wrote:
8 should be much much earlier (tbh it shouldn't even be on the test)

I spent a whole hour or more trying to figure out this problem and I still couldn't figure it out. :(

Same, except I figured it out with 20 minutes to spare lol

tbh for me p8 wasn't hard it was just a lot of big numbers
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meduh6849
354 posts
#8
Y by
p8 has a key insight that's around -5 MOHS, its pretty well-placed tho
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avisioner
294 posts
#9
Y by
12 > 14 imo, 14 was mostly many necessary calculations
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smartguy888
5706 posts
#10
Y by
lowk problem 2 was easier than problem 1 (at least a bit less bashier)
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Math4Life7
1703 posts
#11
Y by
1, 2, 3, 6, 4, 5, 8, 7, 9, 15, 11, 10, 12, 13, 14
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Awesomeness_in_a_bun
476 posts
#12
Y by
11 after 15 is a HOT take imo

1, 3, 4, 2, 6, 5, 11, 8, 7, 15, 10, 12, 13, 14

extremely biased because my skillset is really scuffed (Terrible at logs/complex numbers/dont know inequalities)
This post has been edited 1 time. Last edited by Awesomeness_in_a_bun, Feb 3, 2024, 3:32 AM
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Math4Life7
1703 posts
#13
Y by
Awesomeness_in_a_bun wrote:
11 after 15 is a HOT take imo

1, 3, 4, 2, 6, 5, 11, 8, 7, 15, 10, 12, 13, 14

yea that's true :D
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Bluesoul
894 posts
#14
Y by
1 2 4 6 3 5 7 8 9 15 11 10 13 14 12
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pi_is_3.14
1437 posts
#15 • 5 Y
Y by MathFan335, regiszhou, Jack_w, abrahms, roribaki
2<1<4<6<3<<5<7<8<9<10<11<<15<14<13<<<<<<<<<12 (even MAA got wrong)
This post has been edited 1 time. Last edited by pi_is_3.14, Feb 3, 2024, 6:16 PM
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