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k a May Highlights and 2025 AoPS Online Class Information
jlacosta   0
Yesterday at 11:16 PM
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
1 viewing
jlacosta
Yesterday at 11:16 PM
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
Points U,V,F,E are concyclic (GAMO P5)
Aritra12   4
N 11 minutes ago by ihategeo_1969
Source: GAMO day 2 P5
Let $ABC$ be an acute, non-isosceles triangle, $AD,BE,CF$ be its heights and $(c)$ its circumcircle. $FE$ cuts the circumcircle at points $S,T$, with point $F$ being between points $S,E$. In addition, let $P,Q$ be the midpoints of the major and the minor arc $BC$, respectively. Line $DQ$ cuts $(c)$ at $R$. The circumcircles of triangles $RSF,TER,SFP$ and $TEP$ cut again $PR$ at points $X,Y,Z$ and $W$, respectively. Suppose $(\ell)$ is the line passing through the circumcenters of triangles $AXW,AYZ$ and $(\ell_B ),(\ell_C)$ the parallel lines through $B,C$ to $(\ell)$. If $(\ell_B)$ meets $CF$ at $U$ and $(\ell_C )$ meets $BE$ at $V$, then prove that points $U,V,F,E$ are concyclic.

$\textit{Proposed by Orestis Lignos}$
4 replies
Aritra12
Apr 12, 2021
ihategeo_1969
11 minutes ago
Min and Max
giangtruong13   1
N 13 minutes ago by imnotgoodatmathsorry
Source: PTNK-HCM Specialized School's Practical Math Test (Round 1)
Let $a,b \geq 0$ such that: $a^3+b^3=2$.Prove that: $$  \sqrt[3]{4} \geq a^2-ab+b^2 \geq 1$$
1 reply
giangtruong13
24 minutes ago
imnotgoodatmathsorry
13 minutes ago
Functional Equation f(x(1+y)) = f(x)(1+f(y))
minimario   4
N 23 minutes ago by HuongToiVMO
Solve in $\mathbb{R}: f(x(1+y)) = f(x)(1+f(y))$
4 replies
minimario
Aug 16, 2015
HuongToiVMO
23 minutes ago
Mmo 9-10 graders P5
Bet667   6
N 31 minutes ago by sqing
Let $a,b,c,d$ be real numbers less than 2.Then prove that $\frac{a^3}{b^2+4}+\frac{b^3}{c^2+4}+\frac{c^3}{d^2+4}+\frac{d^3}{a^2+4}\le4$
6 replies
Bet667
Apr 3, 2025
sqing
31 minutes ago
Functional equations in IMO TST
sheripqr   49
N an hour ago by clarkculus
Source: Iran TST 1996
Find all functions $f: \mathbb R \to \mathbb R$ such that $$ f(f(x)+y)=f(x^2-y)+4f(x)y $$ for all $x,y \in \mathbb R$
49 replies
sheripqr
Sep 14, 2015
clarkculus
an hour ago
Good Permutations in Modulo n
swynca   8
N an hour ago by Thapakazi
Source: BMO 2025 P1
An integer $n > 1$ is called $\emph{good}$ if there exists a permutation $a_1, a_2, a_3, \dots, a_n$ of the numbers $1, 2, 3, \dots, n$, such that:
$(i)$ $a_i$ and $a_{i+1}$ have different parities for every $1 \leq i \leq n-1$;
$(ii)$ the sum $a_1 + a_2 + \cdots + a_k$ is a quadratic residue modulo $n$ for every $1 \leq k \leq n$.
Prove that there exist infinitely many good numbers, as well as infinitely many positive integers which are not good.
8 replies
swynca
Apr 27, 2025
Thapakazi
an hour ago
Interesting inequalities
sqing   0
an hour ago
Source: Own
Let $ a,b,c>0 $ and $ (a+b)^2 (a+c)^2=16abc. $ Prove that
$$ 2a+b+c\leq \frac{128}{27}$$$$ \frac{9}{2}a+b+c\leq \frac{864}{125}$$$$3a+b+c\leq 24\sqrt{3}-36$$$$5a+b+c\leq \frac{4(8\sqrt{6}-3)}{9}$$
0 replies
sqing
an hour ago
0 replies
Geometry..Pls
Jackson0423   3
N an hour ago by Jackson0423
In equilateral triangle \( ABC \), let \( AB = 10 \). Point \( D \) lies on segment \( BC \) such that \( BC = 4 \cdot DC \). Let \( O \) and \( I \) be the circumcenter and incenter of triangle \( ABD \), respectively. Let \( O' \) and \( I' \) be the circumcenter and incenter of triangle \( ACD \), respectively. Suppose that lines \( OI \) and \( O'I' \) intersect at point \( X \). Find the length of \( XD \).
3 replies
Jackson0423
Yesterday at 2:43 PM
Jackson0423
an hour ago
How many variables?
Lukaluce   1
N an hour ago by a_507_bc
Source: BMO SL 2024 A1
Let $u, v, w$ be positive reals. Prove that there is a cyclic permutation $(x, y, z)$ of $(u, v, w)$ such that the inequality:
$$\frac{a}{xa + yb + zc} + \frac{b}{xb + yc  + za} + \frac{c}{xc + ya + zb} \ge 
\frac{3}{x + y + z}$$holds for all positive real numbers $a,  b$ and $c$.
1 reply
Lukaluce
an hour ago
a_507_bc
an hour ago
find the radius of circumcircle!
jennifreind   0
an hour ago
In $\triangle \rm ABC$, $  \angle \rm B$ is acute, $\rm{\overline{BC}} = 8$, and $\rm{\overline{AC}} = 3\rm{\overline{AB}}$. Let point $\rm D$ be the intersection of the tangent to the circumcircle of $\triangle \rm ABC$ at point $\rm A$ and the perpendicular bisector of segment $\rm{\overline{BC}}$. Given that $\rm{\overline{AD}} = 6$, find the radius of the circumcircle of $\triangle \rm BCD$.
IMAGE
0 replies
jennifreind
an hour ago
0 replies
SMT Online 2025 Certificates/Question Paper/Grading
techb   10
N an hour ago by techb
It is May 1st. I have been anticipating the arrival of my results displayed in the awards ceremony in the form of a digital certificate. I have unfortunately not received anything. I have heard from other sources(AoPS, and the internet), that the certificates generally arrive at the end of the month. I would like to ask the organizers, or the coordinators of the tournament, to at least give us an ETA. I would like to further elaborate on the expedition of the release of the Question Papers and the grading. The question papers would be very helpful to the people who have taken the contest, and also to other people who would like to solve them. It would also help, as people can discuss the problems that were given in the test, and know different strategies to solve a problem they have solved. In regards to the grading, it would be a crucial piece of evidence to dispute the score shown in the awards ceremony, in case the contestant is not satisfied.
10 replies
techb
Yesterday at 7:21 PM
techb
an hour ago
How many people get waitlisted st promys?
dragoon   34
N 2 hours ago by dragoon
Asking for a friend here
34 replies
1 viewing
dragoon
Apr 18, 2025
dragoon
2 hours ago
pink mop through blue
vincentwant   4
N 4 hours ago by vincentwant
does there exist a corresponding pink mop cutoff for blue? it exists for red and i think green as well but idk about blue

if it exists what was the cutoff thsi year
4 replies
vincentwant
Today at 3:48 AM
vincentwant
4 hours ago
June contests?
abbominable_sn0wman   4
N Today at 3:57 AM by Sid-darth-vater
are there any good/fun math contests in june? obviously arml, but anything else?
4 replies
abbominable_sn0wman
Today at 1:46 AM
Sid-darth-vater
Today at 3:57 AM
Modular Arithmetic Handout
MathCosine   18
N Apr 11, 2025 by nsking_1209
Hi everyone,

I recently created a handout on modular arithmetic for a local math club. I thought it would help quite a lot with understanding basic properties, as modular arithmetic is a very popular intermediate step in number theory problems, so I decided to leave it here as a resource for anyone who needs it. Feel free to share it around, and hope it helps!

Sincerely,
MathCosine
18 replies
MathCosine
Apr 7, 2025
nsking_1209
Apr 11, 2025
Modular Arithmetic Handout
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MathCosine
155 posts
#1 • 3 Y
Y by Awesome_Twin1, Pengu14, Sedro
Hi everyone,

I recently created a handout on modular arithmetic for a local math club. I thought it would help quite a lot with understanding basic properties, as modular arithmetic is a very popular intermediate step in number theory problems, so I decided to leave it here as a resource for anyone who needs it. Feel free to share it around, and hope it helps!

Sincerely,
MathCosine
Attachments:
Modular_Arithmetic_Intro_v1.pdf (137kb)
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jb2015007
1931 posts
#2
Y by
yeesssss ty i need this
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franklin2013
274 posts
#3
Y by
same for me tysm!
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Jaxman8
120 posts
#4
Y by
Is there an intermediate
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jb2015007
1931 posts
#5
Y by
pls make more! People like me need them!

also another suggestion is make them a tad longer other than that though, its amazing!
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sadas123
1252 posts
#6
Y by
Jaxman8 wrote:
Is there an intermediate

Eulers tolient helps to find the number of positive integers that are relatively prime to x and below right?
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sadas123
1252 posts
#7
Y by
sadas123 wrote:
Jaxman8 wrote:
Is there an intermediate

Eulers tolient helps to find the number of positive integers that are relatively prime to x and below right?

I am a bit rusty to number Theory srry
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mathprodigy2011
324 posts
#8
Y by
sadas123 wrote:
Jaxman8 wrote:
Is there an intermediate

Eulers tolient helps to find the number of positive integers that are relatively prime to x and below right?

Number of positive integers less than x which are relatively prime to x is known as eulers totient function or phi(x)
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Pengu14
588 posts
#9
Y by
mathprodigy2011 wrote:
sadas123 wrote:
Jaxman8 wrote:
Is there an intermediate

Eulers tolient helps to find the number of positive integers that are relatively prime to x and below right?

Number of positive integers less than x which are relatively prime to x is known as eulers totient function or phi(x)

ADMITS
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greenturtle3141
3557 posts
#10 • 2 Y
Y by scannose, Sedro
Quote:
$$9^{1012} \equiv (-1)^{1012}$$
This is not at all obvious based on what you've written thus far! This trick is too important to simply gloss over.
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lord_of_the_rook
149 posts
#11
Y by
One small nitpick: You say that $a | b$ if there exists $c$ such that $\frac b a = c$. However, we say that $0 | 0$, so I think a better definition would be that there exists some $c$ such that $b = ac$.
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fake123
93 posts
#12
Y by
greenturtle3141 wrote:
Quote:
$$9^{1012} \equiv (-1)^{1012}$$
This is not at all obvious based on what you've written thus far! This trick is too important to simply gloss over.

how? it's just the units digit
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MathCosine
155 posts
#13 • 1 Y
Y by lord_of_the_rook
lord_of_the_rook wrote:
One small nitpick: You say that $a | b$ if there exists $c$ such that $\frac b a = c$. However, we say that $0 | 0$, so I think a better definition would be that there exists some $c$ such that $b = ac$.

Thanks, I’ll update it soon.
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MathCosine
155 posts
#14
Y by
Jaxman8 wrote:
Is there an intermediate

maybe I could… if this is really good, I could try to make another intermediate one for topics like quadratic reciprocity…
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Jaxman8
120 posts
#15
Y by
Yes, this was a really good intro hand out. Thank you!
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idk12345678
391 posts
#16 • 1 Y
Y by franklin2013
MathCosine wrote:
Jaxman8 wrote:
Is there an intermediate

maybe I could… if this is really good, I could try to make another intermediate one for topics like quadratic reciprocity…

that would be really helpful
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MathCosine
155 posts
#17
Y by
Jaxman8 wrote:
Yes, this was a really good intro hand out. Thank you!

Glad you enjoyed it! I'll get to an intermediate one soon.
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N3bula
269 posts
#18
Y by
MathCosine wrote:
Jaxman8 wrote:
Is there an intermediate

maybe I could… if this is really good, I could try to make another intermediate one for topics like quadratic reciprocity…

wtf is quadratic reciprocity is intermediate wtf is advanced nt just straight up analytic or algebraic nt like bro if ur pulling out cherbatov density in an exam ur trolling
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nsking_1209
171 posts
#19
Y by
binomial theorem and wilson's theorem can be used for mods as well
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