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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 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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Prealgebra 1 Self-Paced

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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
Question about AMC 10/12 and AIME book
ConfidentKoala4   3
N 2 minutes ago by smbellanki
Hi,
I was wondering if the following book is worth going through. It has A LOT of problems and i dont want to waste time if there are better resources. Does anyone know something about this, and can comment?
Thanks
https://www.omegalearn.org/mastering-amc1012
3 replies
+2 w
ConfidentKoala4
2 hours ago
smbellanki
2 minutes ago
9 Fun Proof Endings
elasticwealth   49
N 12 minutes ago by vadava_lx
It seems like AOPS is going through a stressful phase right now.

Let's lighten the mood by voting on the best proof endings!
49 replies
elasticwealth
Yesterday at 12:26 AM
vadava_lx
12 minutes ago
Polynomials
P162008   0
35 minutes ago
Consider the identity $\sum_{r=1}^{n} r = \frac{n(n + 1)}{2}.$ If we set $P_{1}(x) = \frac{x(x + 1)}{2}$ then it's the unique polynomial such that for all integers $n,$ $P_{1}(n) = \sum_{r=1}^{n} r.$ In general, for each positive integer k,there is a unique polynomial $P_{k}(x)$ such that $P_{k}(n) = \sum_{r=1}^{k} r^k \forall  n \in  \mathbb{Z}.$ Find the value of $P_{2010}(m)$ for $m = \frac{-1}{2}.$
0 replies
P162008
35 minutes ago
0 replies
Polynomials
P162008   0
an hour ago
Define a family of polynomials by $P_{0}(x) = x - 2$ and $P_{k}(x) = \left(P_{k - 1} (x)\right)^2 - 2$ if $k \geq 1$ then find the coefficient of $x^2$ in $P_{k}(x)$ in terms of $k.$
0 replies
P162008
an hour ago
0 replies
USAM(inimize)OOO
277546   73
N an hour ago by lpieleanu
Source: 2020 USOMO Problem 1
Let $ABC$ be a fixed acute triangle inscribed in a circle $\omega$ with center $O$. A variable point $X$ is chosen on minor arc $AB$ of $\omega$, and segments $CX$ and $AB$ meet at $D$. Denote by $O_1$ and $O_2$ the circumcenters of triangles $ADX$ and $BDX$, respectively. Determine all points $X$ for which the area of triangle $OO_1O_2$ is minimized.

Proposed by Zuming Feng
73 replies
277546
Jun 21, 2020
lpieleanu
an hour ago
Collect ...
luutrongphuc   3
N an hour ago by KevinYang2.71
Find all functions $f: \mathbb{R^+} \rightarrow \mathbb{R^+}$ such that:
$$f\left(f(xy)+1\right)=xf\left(x+f(y)\right)$$
3 replies
luutrongphuc
Apr 21, 2025
KevinYang2.71
an hour ago
functional equation interesting
skellyrah   5
N 2 hours ago by jasperE3
find all functions IR->IR such that $$xf(x+yf(xy)) + f(f(y)) = f(xf(y))^2  + (x+1)f(x)$$
5 replies
skellyrah
Yesterday at 8:32 PM
jasperE3
2 hours ago
Mathcounts state
happymoose666   24
N 2 hours ago by Math-lover1
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure
24 replies
1 viewing
happymoose666
Mar 24, 2025
Math-lover1
2 hours ago
For a there exist b,c with b+c-2a = 0 mod p
Miquel-point   0
3 hours ago
Source: Kürschák József Competition 2024/3
Let $p$ be a prime and $H\subseteq \{0,1,\ldots,p-1\}$ a nonempty set. Suppose that for each element $a\in H$ there exist elements $b$, $c\in H\setminus \{a\}$ such that $b+ c-2a$ is divisible by $p$. Prove that $p<4^k$, where $k$ denotes the cardinality of $H$.
0 replies
1 viewing
Miquel-point
3 hours ago
0 replies
The ancient One-Dimensional Empire
Miquel-point   0
3 hours ago
Source: Kürschák József Competition 2024/2
The ancient One-Dimensional Empire was located along a straight line. Initially, there were no cities. A total of $n$ different point-like cities were founded one by one; from the second onwards, each newly founded city and the nearest existing city (the older one, if there were two) were declared sister cities. The surviving map of the empire shows the cities and the distances between them, but not the order in which they were founded. Historians have tried to deduce from the map that each city had at most 41 sister cities.
[list=a]
[*] For $n=10^6$, give a map from which this deduction can be made.
[*] Prove that for $n=10^{13}$, this conclusion cannot be drawn from any map.
[/list]
0 replies
Miquel-point
3 hours ago
0 replies
Cyclic quads jigsaw
Miquel-point   0
3 hours ago
Source: Kürschák József Competition 2024/1
The quadrilateral $ABCD$ is divided into cyclic quadrilaterals with pairwise disjoint interiors. None of the vertices of the cyclic quadrilaterals in the decomposition is an interior point of a side of any cyclic quadrilateral in the decomposition or of a side of the quadrilateral $ABCD$. Prove that $ABCD$ is also a cyclic quadrilateral.
0 replies
Miquel-point
3 hours ago
0 replies
A cyclic inequality
KhuongTrang   3
N 3 hours ago by paixiao
Source: own-CRUX
IMAGE
https://cms.math.ca/.../uploads/2025/04/Wholeissue_51_4.pdf
3 replies
KhuongTrang
Apr 21, 2025
paixiao
3 hours ago
Perfect polynomials
Phorphyrion   5
N 4 hours ago by Davdav1232
Source: 2023 Israel TST Test 5 P3
Given a polynomial $P$ and a positive integer $k$, we denote the $k$-fold composition of $P$ by $P^{\circ k}$. A polynomial $P$ with real coefficients is called perfect if for each integer $n$ there is a positive integer $k$ so that $P^{\circ k}(n)$ is an integer. Is it true that for each perfect polynomial $P$, there exists a positive $m$ so that for each integer $n$ there is $0<k\leq m$ for which $P^{\circ k}(n)$ is an integer?
5 replies
Phorphyrion
Mar 23, 2023
Davdav1232
4 hours ago
Finding all integers with a divisibility condition
Tintarn   14
N 5 hours ago by Assassino9931
Source: Germany 2020, Problem 4
Determine all positive integers $n$ for which there exists a positive integer $d$ with the property that $n$ is divisible by $d$ and $n^2+d^2$ is divisible by $d^2n+1$.
14 replies
Tintarn
Jun 22, 2020
Assassino9931
5 hours ago
9 RSM or AoPS?
BlazingSun1200   69
N Apr 16, 2025 by Yihangzh
I'm doing RSM right now, but I want to switch over to AoPS. I'm just curious to know, which do you prefer? (If you have no experience with both, please don't vote!)

If you want, please drop some advice on the Intermediate Algebra class, because that's the one I'm hoping to take!
69 replies
BlazingSun1200
Mar 21, 2021
Yihangzh
Apr 16, 2025
RSM or AoPS?
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BlazingSun1200
36 posts
#1 • 1 Y
Y by john0512
9Poll:
Do you prefer RSM (Russian School of Math) or AoPS?
390 Votes
5%
(21)
87%
(341)
7%
(28)
Hide Results Show Results
You must be signed in to vote.
I'm doing RSM right now, but I want to switch over to AoPS. I'm just curious to know, which do you prefer? (If you have no experience with both, please don't vote!)

If you want, please drop some advice on the Intermediate Algebra class, because that's the one I'm hoping to take!
This post has been edited 1 time. Last edited by BlazingSun1200, Mar 21, 2021, 3:08 AM
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smartguy888
5706 posts
#2 • 8 Y
Y by samrocksnature, JVAJVA, wamofan, john0512, Jbomb01, suvamkonar, megarnie, pi-ay
I heard enough about RSM. AoPS is way better

boooooo RSM prooooooo AoPS

also, note that you are posting on AoPS. There will be very much bias.
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BlazingSun1200
36 posts
#3 • 2 Y
Y by john0512, Mango247
smartguy888 wrote:
I heard enough about RSM. AoPS is way better

boooooo RSM prooooooo AoPS

also, note that you are posting on AoPS. There will be very much bias.

Yes I thought so lol
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Possible
6504 posts
#4 • 7 Y
Y by NightFury101, john0512, mickeyaops, Jbomb01, suvamkonar, evanhliu2009, megarnie
Poor RSM.
Attachments:
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mathacker23
914 posts
#5 • 7 Y
Y by jyue, ilovepizza2020, john0512, evanhliu2009, Gelato, suvamkonar, megarnie
I went to RSM for 3 years, and lemme just tell you, it's pretty useless.
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NightFury101
1096 posts
#6 • 1 Y
Y by john0512
Lol I used to take RSM

they're not actually bad it's just boring tho although I will agree AoPS is better XD

RSM just makes you grind on problems
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RandomlyQuestioning
408 posts
#7 • 1 Y
Y by john0512
Tbh it's up to you which style of teaching you like better but I'd say AoPS personally, (but the poll will be biased). Some people I know really benefit from RSM but some people never did, but there are definitely more people (around me) that prefer AoPS to RSM.
This post has been edited 1 time. Last edited by RandomlyQuestioning, Mar 21, 2021, 3:22 AM
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PlaneGod
452 posts
#8 • 1 Y
Y by john0512
what is this RSM thing and how do you sign up for it?
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NightFury101
1096 posts
#9 • 1 Y
Y by john0512
PlaneGod wrote:
what is this RSM thing and how do you sign up for it?

RSM is the Russian School of Math, and you can either look at their website or go into one of the branches nearby you and sign up lol
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Possible
6504 posts
#10 • 1 Y
Y by john0512
PlaneGod wrote:
what is this RSM thing and how do you sign up for it?

RSM
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JVAJVA
618 posts
#11 • 4 Y
Y by NightFury101, Critical, john0512, megarnie
i don't quite know why you would post this on aops, because there will be a huge, HUGE amount of bias lol. ofc i like aops >>>>>>>>>>>> RSM :-D
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mathacker23
914 posts
#12 • 4 Y
Y by Critical, john0512, JVAJVA, megarnie
RSM is not very in-depth. It's more about swallowing rather than chewing.
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Senguamar
825 posts
#13 • 1 Y
Y by john0512
what is the difference between rsm and aops academy?? I feeel like aops academy is rsm with aops'name slapped upon it.
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warriors4life
786 posts
#14 • 1 Y
Y by john0512
There's a new program that RSM has for competition math and preparing for amc 10/12 and aime. They take a select amount of students from all around the country, and their teachers are extremely good and from all around the world.
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Senguamar
825 posts
#15 • 1 Y
Y by john0512
warriors4life wrote:
There's a new program that RSM has for competition math and preparing for amc 10/12 and aime. They take a select amount of students from all around the country, and their teachers are extremely good and from all around the world.

ye i made that program but then i quit lol
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