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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.

Introductory: Grades 5-10

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
2025 ELMOCOUNTS - Mock MATHCOUNTS Nationals
vincentwant   123
N 7 minutes ago by iwastedmyusername
text totally not copied over from wmc (thanks jason <3)
Quick Links:
[list=disc]
[*] National: (Sprint) (Target) (Team) (Sprint + Target Submission) (Team Submission) [/*]
[*] Miscellaneous: (Leaderboard) (Sprint + Target Private Discussion Forum) (Team Discussion Forum)[/*]
[/list]
-----
Eddison Chen (KS '22 '24), Aarush Goradia (CO '24), Ethan Imanuel (NJ '24), Benjamin Jiang (FL '23 '24), Rayoon Kim (PA '23 '24), Jason Lee (NC '23 '24), Puranjay Madupu (AZ '23 '24), Andy Mo (OH '23 '24), George Paret (FL '24), Arjun Raman (IN '24), Vincent Wang (TX '24), Channing Yang (TX '23 '24), and Jefferson Zhou (MN '23 '24) present:



[center]IMAGE[/center]

[center]Image credits to Simon Joeng.[/center]

2024 MATHCOUNTS Nationals alumni from all across the nation have come together to administer the first-ever ELMOCOUNTS Competition, a mock written by the 2024 Nationals alumni given to the 2025 Nationals participants. By providing the next generation of mathletes with free, high quality practice, we're here to boast how strong of an alumni community MATHCOUNTS has, as well as foster interest in the beautiful art that is problem writing!

The tests and their corresponding submissions forms will be released here, on this thread, on Monday, April 21, 2025. The deadline is May 10, 2025. Tests can be administered asynchronously at your home or school, and your answers should be submitted to the corresponding submission form. If you include your AoPS username in your submission, you will be granted access to the private discussion forum on AoPS, where you can discuss the tests even before the deadline.
[list=disc]
[*] "How do I know these tests are worth my time?" [/*]
[*] "Who can participate?" [/*]
[*] "How do I sign up?" [/*]
[*] "What if I have multiple students?" [/*]
[*] "What if a problem is ambiguous, incorrect, etc.?" [/*]
[*] "Will there be solutions?" [/*]
[*] "Will there be a Countdown Round administered?" [/*]
[/list]
If you have any other questions, feel free to email us at elmocounts2025@gmail.com (or PM me)!
123 replies
+1 w
vincentwant
Apr 20, 2025
iwastedmyusername
7 minutes ago
2 var inequalities
sqing   1
N 35 minutes ago by sqing
Source: Own
Let $ a,b\geq 0 $ and $ a^2+b^2=1 . $ Prove that
$$ \frac{a}{ 1+ab+b }+\frac{b }{ 1+ab+a }+\frac{ab }{1+ ab }   \leq  1$$$$   \frac{a}{ 1+ab+b }+\frac{b }{ 1+ab+a }+\frac{ab }{\frac{1}{2}+ ab }\leq \frac{6\sqrt 2 }{7 }- \frac{1 }{14 } $$$$   \frac{a}{ 1+ab+b }+\frac{b }{ 1+ab+a }+\frac{ab }{1+\frac{1}{2} ab }\leq \frac{6(5\sqrt 2-1) }{35 }$$
1 reply
1 viewing
sqing
38 minutes ago
sqing
35 minutes ago
B.Math - geometry
mynamearzo   9
N 36 minutes ago by Apple_maths60
In a triangle $ABC$ , $D$ is a point on $BC$ such that $AD$ is the internal bisector of $\angle A$ . Now Suppose $\angle B$=$2\angle C$ and $CD=AB$ . Prove that $\angle A=72^0$.
9 replies
mynamearzo
Jun 17, 2012
Apple_maths60
36 minutes ago
Irrational equation
giangtruong13   5
N 39 minutes ago by pooh123
Solve the equation : $$(\sqrt{x}+1)[2-(x-6)\sqrt{x-3}]=x+8$$
5 replies
giangtruong13
Yesterday at 1:44 PM
pooh123
39 minutes ago
CHINA TST 2017 P6 DAY1
lingaguliguli   1
N 39 minutes ago by GreekIdiot
When i search the china TST 2017 problem 6 day I i crossed out this lemme, but don't know to prove it, anyone have suggestion? tks
Given a fixed number n, and a prime p. Let f(x)=(x+a_1)(x+a_2)...(x+a_n) in which a_1,a_2,...a_n are positive intergers. Show that there exist an interger M so that 0<v_p((f(M))< n + v_p(n!)
1 reply
lingaguliguli
Apr 23, 2025
GreekIdiot
39 minutes ago
Geometry inmo problem
Enes040612   2
N 41 minutes ago by Red_gear5246
Source: INMO 2008
Can anyone help with this problem? the book also starts the solution by saying IA1=IB1=IC1=2r which I'm not understanding why. The problem is at the attachments.
2 replies
Enes040612
Feb 13, 2025
Red_gear5246
41 minutes ago
Sharing My Solutions for IMO 2023 (All 6 Problems) – Feedback Welcome
Blackhole.LightKing   4
N 44 minutes ago by GreekIdiot
Hi everyone,

I worked through all six problems from the 2023 International Mathematical Olympiad (IMO 2023), and I would like to share my solutions here.

I tried to make the explanations clear and complete, and I also added diagrams for the geometry problems to make them easier to follow.

Topics covered:

Number Theory

Geometry

Algebra

Combinatorics

You can find the full solution PDF attached (or linked below).

https://agi-origin.ai/assets/pdf/AGI-Origin_IMO_2023_Solution.pdf

I’m still learning, so if you see any mistakes, unclear parts, or better ways to explain things, I would really appreciate your feedback!

Thank you for reading, and I hope this can be helpful to others who are studying IMO problems too
4 replies
Blackhole.LightKing
an hour ago
GreekIdiot
44 minutes ago
System of two diophantine equations
AlastorMoody   4
N an hour ago by MATHS_ENTUSIAST
Source: Balkan MO ShortList 2007 N1
Solve the given system in prime numbers
\begin{align*} x^2+yu = (x+u)^v \end{align*}\begin{align*} x^2+yz=u^4 \end{align*}
4 replies
AlastorMoody
Apr 6, 2020
MATHS_ENTUSIAST
an hour ago
A bash problem
kjhgyuio   1
N an hour ago by zhoujef000
........
1 reply
kjhgyuio
an hour ago
zhoujef000
an hour ago
Minimum term of n^m
Kunihiko_Chikaya   1
N an hour ago by Mathzeus1024
Source: 19?? Mie University entrance exam
For any two positive integers $ m,\ n\ (m\geq 2)$, suppose that $ n^m$ is expressed by the sum of $ n$ consecutive odd numbers. Express the minimum term in terms of $ n$ and $ m$.
1 reply
Kunihiko_Chikaya
Jan 28, 2010
Mathzeus1024
an hour ago
true or false ?
SunnyEvan   5
N an hour ago by SunnyEvan
Let $ a,b,c \geq 0 $ Prove that :
$$ \frac{3k}{k^4+k+1} \leq \frac{ka}{a+k^4b+kc}+\frac{kb}{b+k^4c+ka}+\frac{kc}{c+k^4a+kb} \leq k $$Where $ k \geq 1 $
5 replies
SunnyEvan
Apr 20, 2025
SunnyEvan
an hour ago
9 Fun Proof Endings
elasticwealth   51
N 2 hours ago by steve4916
It seems like AOPS is going through a stressful phase right now.

Let's lighten the mood by voting on the best proof endings!
51 replies
elasticwealth
Yesterday at 12:26 AM
steve4916
2 hours ago
An FE. Who woulda thunk it?
nikenissan   115
N Today at 8:04 AM by Ilikeminecraft
Source: 2021 USAJMO Problem 1
Let $\mathbb{N}$ denote the set of positive integers. Find all functions $f : \mathbb{N} \rightarrow \mathbb{N}$ such that for positive integers $a$ and $b,$ \[f(a^2 + b^2) = f(a)f(b) \text{ and } f(a^2) = f(a)^2.\]
115 replies
nikenissan
Apr 15, 2021
Ilikeminecraft
Today at 8:04 AM
average FE
KevinYang2.71   81
N Today at 8:03 AM by Ilikeminecraft
Source: USAJMO 2024/5
Find all functions $f:\mathbb{R}\rightarrow\mathbb{R}$ that satisfy
\[
f(x^2-y)+2yf(x)=f(f(x))+f(y)
\]for all $x,y\in\mathbb{R}$.

Proposed by Carl Schildkraut
81 replies
KevinYang2.71
Mar 21, 2024
Ilikeminecraft
Today at 8:03 AM
[Tests + Stats Released] SFA's 2021 Orange Mathematics Competition (OMC) 10/12
ilovemath04   201
N Aug 19, 2022 by ASnooby
Hello AoPS!

After a successful mock contest with the OMC 8, STEAM For All is excited to announce its first ever


[center]OMC 10/12[/center]

The virtual Orange Mathematics Competition (OMC) 10/12, is a Mock American Mathematics Competition (AMC) 10/12 with questions written by STEAM for All volunteers! Our problem writers and testsolvers consist of a two-time MOPper, a two-time USAJMO qualifier, and plenty of AIME qualifiers.

The mock contest offers two entirely free online math contests, the OMC 10 and the OMC 12. Students may only take one exam, and students in grades 10 and below are eligible for the OMC 10 while students in grades 12 and below are eligible for the OMC 12. It is a wonderful opportunity for students to engage in a practice test with fun, original questions, listen to experienced competitors explain solutions to the most difficult questions on the exam, and finish off with an awards ceremony to recognize some of the top scoring students!

Register at https://www.steamforall.org/omc-10-12. Registration ends on Thursday, January 21st, 2021 at 12 PM PST.

The competition will be held on Saturday, January 23rd, 2021 from 4 - 6:30PM PST. The general schedule will be as follows (note that all times below are in PST):
4:00 - 4:15 PM: Introduction
4:15 - 5:30 PM: OMC 10/12 Competition
5:30 - 6:15 PM: Problem Review Session
6:15 - 6:30 PM: Awards and Closing Ceremony

FAQ

As for sample problems, here are a few problems from our problem writers that came up on previous contests! Feel free to discuss any of them in this thread.
Sample Problems

More Questions? Contact us at info@steamforall.org or ask in this thread!

We hope that you join us for the upcoming tournament!

Test Links:

OMC 10: https://drive.google.com/file/d/1UVlvprEDwY_l9zTGV7VqW_Ymz1FYQ7Uk/view?usp=sharing

OMC 12: https://drive.google.com/file/d/1SVWk3bJUsMUQR9RUQ1P6YBsIXcHS1uYn/view?usp=sharing

Statistics attached.
201 replies
ilovemath04
Jan 12, 2021
ASnooby
Aug 19, 2022
[Tests + Stats Released] SFA's 2021 Orange Mathematics Competition (OMC) 10/12
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