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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.
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[*]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
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
ISI UGB 2025 P4
SomeonecoolLovesMaths   5
N a few seconds ago by mqoi_KOLA
Source: ISI UGB 2025 P4
Let $S^1 = \{ z \in \mathbb{C} \mid |z| =1 \}$ be the unit circle in the complex plane. Let $f \colon S^1 \longrightarrow S^2$ be the map given by $f(z) = z^2$. We define $f^{(1)} \colon = f$ and $f^{(k+1)} \colon = f \circ f^{(k)}$ for $k \geq 1$. The smallest positive integer $n$ such that $f^{(n)}(z) = z$ is called the period of $z$. Determine the total number of points in $S^1$ of period $2025$.
(Hint : $2025 = 3^4 \times 5^2$)
5 replies
1 viewing
SomeonecoolLovesMaths
Yesterday at 11:24 AM
mqoi_KOLA
a few seconds ago
hard inequality omg
tokitaohma   3
N 25 minutes ago by tokitaohma
1. Given $a, b, c > 0$ and $abc=1$
Prove that: $ \sqrt{a^2+1} + \sqrt{b^2+1} + \sqrt{c^2+1} \leq \sqrt{2}(a+b+c) $

2. Given $a, b, c > 0$ and $a+b+c=1 $
Prove that: $ \dfrac{\sqrt{a^2+2ab}}{\sqrt{b^2+2c^2}} + \dfrac{\sqrt{b^2+2bc}}{\sqrt{c^2+2a^2}} + \dfrac{\sqrt{c^2+2ca}}{\sqrt{a^2+2b^2}} \geq \dfrac{1}{a^2+b^2+c^2} $
3 replies
tokitaohma
Yesterday at 5:24 PM
tokitaohma
25 minutes ago
Divisibilty...
Sadigly   5
N 26 minutes ago by COCBSGGCTG3
Source: Azerbaijan Junior NMO 2025 P2
Find all $4$ consecutive even numbers, such that the sum of their squares divides the square of their product.
5 replies
Sadigly
Saturday at 9:07 PM
COCBSGGCTG3
26 minutes ago
Diophantine involving cube
Sadigly   1
N 40 minutes ago by mashumaro
Source: Azerbaijan Senior NMO 2020
$a;b;c;d\in\mathbb{Z^+}$. Solve the equation: $$2^{a!}+2^{b!}+2^{c!}=d^3$$
1 reply
Sadigly
5 hours ago
mashumaro
40 minutes ago
Old hard problem
ItzsleepyXD   2
N an hour ago by ItzsleepyXD
Source: IDK
Let $ABC$ be a triangle and let $O$ be its circumcenter and $I$ its incenter.
Let $P$ be the radical center of its three mixtilinears and let $Q$ be the isogonal conjugate of $P$.
Let $G$ be the Gergonne point of the triangle $ABC$.
Prove that line $QG$ is parallel with line $OI$ .
2 replies
ItzsleepyXD
Apr 25, 2025
ItzsleepyXD
an hour ago
The Return of Triangle Geometry
peace09   9
N 2 hours ago by mathfun07
Source: 2023 ISL A7
Let $N$ be a positive integer. Prove that there exist three permutations $a_1,\dots,a_N$, $b_1,\dots,b_N$, and $c_1,\dots,c_N$ of $1,\dots,N$ such that \[\left|\sqrt{a_k}+\sqrt{b_k}+\sqrt{c_k}-2\sqrt{N}\right|<2023\]for every $k=1,2,\dots,N$.
9 replies
peace09
Jul 17, 2024
mathfun07
2 hours ago
Set Partition
Butterfly   0
2 hours ago
For the set of positive integers $\{1,2,…,n\}(n\ge 3)$, no matter how its elements are partitioned into two subsets, at least one of the subsets must contain three numbers $a,b,c$ ($a=b$ is allowed) such that $ab=c$. Find the minimal $n$.
0 replies
Butterfly
2 hours ago
0 replies
Points Lying on its Cevian Triangle's Thomson Cubic
Feuerbach-Gergonne   1
N 2 hours ago by golue3120
Source: Own
Given $\triangle ABC$ and a point $P$, let $\triangle DEF$ be the cevian triangle of $P$ with respect to $\triangle ABC$. Let $H$ be the orthocenter of $\triangle ABC$, and denote the isotomic conjugate of $H, P$ with respect to $\triangle ABC$ by $X, Q$, respectively. Let the centroid of $\triangle DEF$ be $M$, and denote the isogonal conjugate of $P$ with respect to $\triangle DEF$ by $R$. Prove that
$$
P, Q, X \text{ are collinear} \iff P, R, M \text{ are collinear}. 
$$or in brief
$$
P \in \text{ K007 of } \triangle ABC \iff P \in \text{ K002 of } \triangle DEF. 
$$
1 reply
Feuerbach-Gergonne
Jul 19, 2024
golue3120
2 hours ago
Areas of triangles AOH, BOH, COH
Arne   71
N 3 hours ago by EpicBird08
Source: APMO 2004, Problem 2
Let $O$ be the circumcenter and $H$ the orthocenter of an acute triangle $ABC$. Prove that the area of one of the triangles $AOH$, $BOH$ and $COH$ is equal to the sum of the areas of the other two.
71 replies
Arne
Mar 23, 2004
EpicBird08
3 hours ago
Problem 6
termas   68
N 3 hours ago by HamstPan38825
Source: IMO 2016
There are $n\ge 2$ line segments in the plane such that every two segments cross and no three segments meet at a point. Geoff has to choose an endpoint of each segment and place a frog on it facing the other endpoint. Then he will clap his hands $n-1$ times. Every time he claps,each frog will immediately jump forward to the next intersection point on its segment. Frogs never change the direction of their jumps. Geoff wishes to place the frogs in such a way that no two of them will ever occupy the same intersection point at the same time.

(a) Prove that Geoff can always fulfill his wish if $n$ is odd.

(b) Prove that Geoff can never fulfill his wish if $n$ is even.
68 replies
termas
Jul 12, 2016
HamstPan38825
3 hours ago
2n^2+4n-1 and 3n+4 have common powers
bin_sherlo   2
N 3 hours ago by Assassino9931
Source: Türkiye 2025 JBMO TST P5
Find all positive integers $n$ such that a positive integer power of $2n^2+4n-1$ equals to a positive integer power of $3n+4$.
2 replies
bin_sherlo
Yesterday at 7:13 PM
Assassino9931
3 hours ago
combi/nt
blug   2
N 3 hours ago by aaravdodhia
Prove that every positive integer $n$ can be written in the form
$$n=a_1+a_2+...+a_k,$$where $a_m=2^i3^j$ for some non-negative $i, j$ such that
$$a_x\nmid a_y$$for every $x, y\leq k$.
2 replies
blug
May 9, 2025
aaravdodhia
3 hours ago
System of equations in juniors' exam
AlperenINAN   2
N 3 hours ago by Assassino9931
Source: Turkey JBMO TST 2025 P3
Find all positive real solutions $(a, b, c)$ to the following system:
$$
\begin{aligned}
a^2 + \frac{b}{a} &= 8, \\
ab + c^2 &= 18, \\
3a + b + c &= 9\sqrt{3}.
\end{aligned}
$$
2 replies
AlperenINAN
Yesterday at 7:41 PM
Assassino9931
3 hours ago
Trigo relation in a right angled. ISIBS2011P10
Sayan   10
N 3 hours ago by mqoi_KOLA
Show that the triangle whose angles satisfy the equality
\[\frac{\sin^2A+\sin^2B+\sin^2C}{\cos^2A+\cos^2B+\cos^2C} = 2\]
is right angled.
10 replies
+1 w
Sayan
Mar 31, 2013
mqoi_KOLA
3 hours ago
IMO 2023 problem discussion
Complete_quadrilateral   108
N Jul 15, 2023 by YIYI-JP
Get your frustrations out here.
108 replies
Complete_quadrilateral
Jul 8, 2023
YIYI-JP
Jul 15, 2023
IMO 2023 problem discussion
G H J
G H BBookmark kLocked kLocked NReply
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Complete_quadrilateral
144 posts
#1 • 2 Y
Y by Rounak_iitr, oolite
Get your frustrations out here.
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Complete_quadrilateral
144 posts
#2 • 2 Y
Y by TheHimMan, Rounak_iitr
Redacted
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799786
1052 posts
#3 • 1 Y
Y by steppewolf
As simple as MOHS scale:
P1: 0M
P2: 10-15M
P3: 25-30M
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Complete_quadrilateral
144 posts
#4 • 1 Y
Y by Rounak_iitr
Redacted
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navi_09220114
479 posts
#5 • 2 Y
Y by lambda5, Rounak_iitr
I get that the notion with "accessibility": Recently there are many new countries participating, and they want to have the easy problems being really accessible to them as well.

1) On one hand I support having easy problems being accesible, but I certainly think that doing that while having HM being at 7 points, really devalues its meaning. [something like 2016 p1/p4 would be really quite hard for an easy problem]

2) I will reapeat my thought from the other thread, of having 4 problems in 5 hours - basically having an easy p1, "hard p1/easy p2", "hard p2/easy p3" (like mine), and a hard p3 [harder than 2017 p3 could be good] that is reserved for the special prizes (?) and making perfect scorers truly outstanding [and of course HM not be 7 anymore]

Its also not too taxing when there are contests like IMTOT A-level, which is also 5 hours long and picking the 3 best questions, or some contests with 4 problems as well.

Bottom line is we don't want the IMO to be a "standard contest", and to have more ingenuity instead. Even the easy problems can be fun too without being an immediate routine exercise.

I also secretly hope that the IMO do get harder every year - it has been so since the very first IMO till somewhere in the 2010s, why can't it be harder now? Students also improve greatly over the years too, its time for the problems to catch up in difficulty as well before cutoffs like 23/29/34 becomes the norm.

Refering to hard problems, I thought of something like IMO 2017 P3 as an excellent example of what I was hoping for, just that I also hoped the students today can solve it much better than it was back then..

(I recall getting excited for more difficult problems in the next few IMOs after 2017, going even further than that, but alas... The closest in difficulty and beauty was probably 2020 P6)

Yeah, just a rant, and hoping to see some radical changes in the IMO for years to come. Eg: 2021 p2 is "great", but only if more students would embrace some analysis/differentiation as standard IMO context too, a direction that I do hope the IMO will go into. So as a little topology/geometry/analysis related problems, modulo the technicalities and sieve out the essential ideas instead. But I am not going to bother changing how the game works - I will merely enjoy creating more problems as my own hobby :>

[Also PS again about p3 being too easy: I sincerely think that my problem should be a p2/5 instead (in line with what I imagined how hard a future IMO should have been), but I am not the one who decided the difficulty in the shortlist, and the paper itself :p]
This post has been edited 11 times. Last edited by navi_09220114, Jul 8, 2023, 5:31 PM
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Complete_quadrilateral
144 posts
#6 • 3 Y
Y by Miquel-point, RobertRogo, lambda5
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khan.academy
634 posts
#7
Y by
redacted..............
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kimyager
8 posts
#8
Y by
khan.academy wrote:

~~I totally agree, the IMO should only be done between the top 20 countries so getting a medal is hard.~~
CantonMathGuy wrote:

not a good opinion tbh
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c7h5n3o6_tnt
117 posts
#9
Y by
Actually many regional MO/TSTs are (much?) harder than IMO.
But this time's Day1 is really nonsence in my opinion :|
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carefully
240 posts
#10 • 7 Y
Y by JingheZhang, navi_09220114, khan.academy, Miquel-point, Schur-Schwartz, Rounak_iitr, ericxyzhu
For me, I think good IMO problems should be all medium, with almost the same difficulty (like 15M / 25M / 35M), so that students can freely choose to solve whichever problem in a subject they're good at.

In such IMOs, gold cut-offs are high and bronze cut-offs are low. My favorite IMO is IMO 2005 (Gold 35, Bronze 12). Looking at the result, you can find people who solved almost any combination of problems (e.g. solving P3,6 but not P1,2,4,5).

However, many recent IMOs went the opposite way; the easy problems got easier, and the hard problems got harder (like 5M / 25M / 50M). Gold cut-offs were low and bronze cut-offs were high.

That's very bad for the competition because medals were basically determined by only two middle problems (and sometimes even one problem) instead of six problems. Luck also plays a larger part, depending on the subject of the middle problems, and whether you can solve this particular problem.

** See IMO 2017 for the extreme case, where gold or silver or bronze or nothing was basically decided on how many partials you got from P2 and P5. **
This post has been edited 2 times. Last edited by carefully, Jul 9, 2023, 10:29 AM
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Aiden-1089
285 posts
#11 • 2 Y
Y by MS_Kekas, Sumgato
As someone who has undergone literally no training for IMO, have knowledge of only basic, introductory number theory, and basically only starting my journey into these olympiads, I solved P1 in less than 10 minutes. I don't think I have solved any number theory problem on the IMO shortlist by myself, nor even on this very site. Considering that a layman such as me found this problem quite easy, I'm not sure how this problem made it into the shortlist, let alone the IMO.
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YIFANK
25 posts
#12
Y by
Complete_quadrilateral wrote:
I personally think that P1 was way too trivial and just doesn't make sense having it on IMO. I believe that everyone who is able to get at least silver should instasolve all such problems (I instasolved it, and I didn't even qualify). I would say that it is maybe even better not having P1 at all if it is going to be this easy, it's just wasting most people's time and makes IMO more of a write-up so you don't lose a point competition than a math one. Or maybe I'm just salty cus I lost too many such points on TST.
Yea I instasolve it but I didn't even get a medal on USAMO (got 22 this year)
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steppewolf
351 posts
#13 • 3 Y
Y by khan.academy, Corella, Sumgato
The main issue that I have with such an easy P1 is the following: the problem should be accessible to untrained contestants, but this does not mean that the problem should be trivial. By giving a trivial problem at the IMO, you basically devalue the meaning of an honourable mention.

It is a much better practice to give a difficult problem that is based on getting the right ingenious idea instead of giving an almost free honourable mention.

Another problem that is caused by giving an overall easy IMO is that it also potentially makes it harder to distinguish between the top contestants and teams. If the gold medal requires almost a perfect score, this also decreases the value of a perfect score. An extreme example of this is when an entire team scores 42 points like last year.
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oolite
344 posts
#14 • 1 Y
Y by steppewolf
One property you'd hope for in a good IMO is that there are relatively few contestants on the borderline between medals.

For each of the past several years, here are the percentage number of contestants having the highest silver/bronze/no-medal score (unlucky) or the lowest gold/silver/bronze score (lucky).

edited to include IMO 2023 stats

By that measure, last year was pretty bad (cf. @steppewolf's comment) and 2005 was exemplary (cf. post #10).
This post has been edited 1 time. Last edited by oolite, Aug 25, 2023, 5:18 PM
Reason: updated stats to include IMO 2023
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S.Das93
709 posts
#15
Y by
I believe the decrease in difficulty level is the influx of LDCs participating in the IMO.
Z K Y
G
H
=
a