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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
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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]
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0 replies
jlacosta
Apr 2, 2025
0 replies
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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
J
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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
J
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9 When Is your Mathcounts State Competition?
MathyMathMan   150
N an hour ago by K1mchi_
When is your Mathcounts State Comp? Mine is on the 11th of March.
150 replies
MathyMathMan
Mar 1, 2023
K1mchi_
an hour ago
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1234th Post!
PikaPika999   218
N an hour ago by K1mchi_
I hit my 1234th post! (I think I missed it, I'm kinda late, :oops_sign:)

But here's a puzzle for you all! Try to create the numbers 1 through 25 using the numbers 1, 2, 3, and 4! You are only allowed to use addition, subtraction, multiplication, division, and parenthesis. If you're post #1, try to make 1. If you're post #2, try to make 2. If you're post #3, try to make 3, and so on. If you're a post after 25, then I guess you can try to make numbers greater than 25 but you can use factorials, square roots, and that stuff. Have fun!

1: $(4-3)\cdot(2-1)$
218 replies
PikaPika999
Apr 21, 2025
K1mchi_
an hour ago
J
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Israel Number Theory
mathisreaI   63
N an hour ago by Maximilian113
Source: IMO 2022 Problem 5
Find all triples $(a,b,p)$ of positive integers with $p$ prime and \[ a^p=b!+p. \]
63 replies
mathisreaI
Jul 13, 2022
Maximilian113
an hour ago
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0!??????
wizwilzo   64
N an hour ago by K1mchi_
why is 0! "1" ??!
64 replies
wizwilzo
Jul 6, 2016
K1mchi_
an hour ago
J
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100th post! (actually 105)
K1mchi_   0
an hour ago
here’s a math problem!
if the aops forum has 50 users and the users post once a minute, then how many posts will be made in a week? note that Fred and ted are twins and Elizabeth only visits the forum on weekends. assume that the users do not post during the 5 hour school day and 8 hours of sleep, but also that they have no life and only grind AOPS. it is not a leap year

anyway

this is my 105th post and I feel like I’ve grown a lot
not rlly lol
i have remained the same perfect person hahaha

Click to reveal hidden text
0 replies
K1mchi_
an hour ago
0 replies
J
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I need help for British maths olympiads
RCY   1
N an hour ago by Miquel-point
I’m a year ten student who’s going to take the bmo in one year.
However I have no experience in maths olympiads and the best results I have achieved so far was 25/60 in intermediate maths olympiads.
What shall I do?
I really need help!
1 reply
RCY
3 hours ago
Miquel-point
an hour ago
J
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Value of the sum
fermion13pi   0
2 hours ago
Source: Australia
Calculate the value of the sum

\sum_{k=1}^{9999999} \frac{1}{(k+1)^{3/2} + (k^2-1)^{1/3} + (k-1)^{2/3}}.
0 replies
fermion13pi
2 hours ago
0 replies
J
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NT Functional Equation
mkultra42   0
2 hours ago
Find all strictly increasing functions \(f: \mathbb{N} \to \mathbb{N}\) satsfying \(f(1)=1\) and:

\[ f(2n)f(2n+1)=9f(n)^2+3f(n)\]
0 replies
mkultra42
2 hours ago
0 replies
J
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Cyclic sum of 1/((3-c)(4-c))
v_Enhance   22
N 2 hours ago by Aiden-1089
Source: ELMO Shortlist 2013: Problem A6, by David Stoner
Let $a, b, c$ be positive reals such that $a+b+c=3$. Prove that \[18\sum_{\text{cyc}}\frac{1}{(3-c)(4-c)}+2(ab+bc+ca)\ge 15. \]Proposed by David Stoner
22 replies
v_Enhance
Jul 23, 2013
Aiden-1089
2 hours ago
J
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x^101=1 find 1/1+x+x^2+1/1+x^2+x^4+...+1/1+x^100+x^200
Mathmick51   6
N 3 hours ago by pi_quadrat_sechstel
Let $x^{101}=1$ such that $x\neq 1$. Find the value of $$\frac{1}{1+x+x^2}+\frac{1}{1+x^2+x^4}+\frac{1}{1+x^3+x^6}+\dots+\frac{1}{1+x^{100}+x^{200}}$$
6 replies
Mathmick51
Jun 22, 2021
pi_quadrat_sechstel
3 hours ago
J
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IMO Shortlist 2014 N5
hajimbrak   60
N 3 hours ago by sansgankrsngupta
Find all triples $(p, x, y)$ consisting of a prime number $p$ and two positive integers $x$ and $y$ such that $x^{p -1} + y$ and $x + y^ {p -1}$ are both powers of $p$.

Proposed by Belgium
60 replies
hajimbrak
Jul 11, 2015
sansgankrsngupta
3 hours ago
J
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n variables with n-gon sides
mihaig   0
3 hours ago
Source: Own
Let $n\geq3$ and let $a_1,a_2,\ldots, a_n\geq0$ be reals such that $\sum_{i=1}^{n}{\frac{1}{2a_i+n-2}}=1.$
Prove
$$\frac{24}{(n-1)(n-2)}\cdot\sum_{1\leq i<j<k\leq n}{a_ia_ja_k}\geq3\sum_{i=1}^{n}{a_i}+n.$$
0 replies
mihaig
3 hours ago
0 replies
J
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4 variables with quadrilateral sides
mihaig   3
N 4 hours ago by mihaig
Source: VL
Let $a,b,c,d\geq0$ satisfying
$$\frac1{a+1}+\frac1{b+1}+\frac1{c+1}+\frac1{d+1}=2.$$Prove
$$4\left(abc+abd+acd+bcd\right)\geq3\left(a+b+c+d\right)+4.$$
3 replies
mihaig
Today at 5:11 AM
mihaig
4 hours ago
J
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Calculate the distance of chess king!!
egxa   5
N 4 hours ago by Tesla12
Source: All Russian 2025 9.4
A chess king was placed on a square of an \(8 \times 8\) board and made $64$ moves so that it visited all squares and returned to the starting square. At every moment, the distance from the center of the square the king was on to the center of the board was calculated. A move is called $\emph{pleasant}$ if this distance becomes smaller after the move. Find the maximum possible number of pleasant moves. (The chess king moves to a square adjacent either by side or by corner.)
5 replies
egxa
Apr 18, 2025
Tesla12
4 hours ago
J
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J
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Math and AI 4 Girls
mkwhe   29
N 5 hours ago by WhitePhoenix
Hey everyone!

The 2025 MA4G competition is now open!

Apply Here: https://xmathandai4girls.submittable.com/submit


Visit https://www.mathandai4girls.org/ to get started!

Feel free to PM or email mathandai4girls@yahoo.com if you have any questions!
29 replies
mkwhe
Apr 5, 2025
WhitePhoenix
5 hours ago
J
Math and AI 4 Girls
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Reveal topic tags
Girls
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mkwhe
168 posts
mkwhe
#1 h  Apr 5, 2025, 11:24 PM • 4 Y
Y by audio-on, avyaank, PikaPika999, GodGodGodGodGoose
Hey everyone!

The 2025 MA4G competition is now open!

Apply Here: https://xmathandai4girls.submittable.com/submit


Visit https://www.mathandai4girls.org/ to get started!

Feel free to PM or email mathandai4girls@yahoo.com if you have any questions!
Attachments:
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avyaank
53 posts
avyaank
#2 h  Apr 5, 2025, 11:25 PM • 2 Y
Y by PikaPika999, GodGodGodGodGoose
audio we liked at the same time lol
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ev2028
2 posts
ev2028
#3 h  Apr 6, 2025, 1:01 PM • 2 Y
Y by PikaPika999, GodGodGodGodGoose
Just a reminder that the competition is still open until the 26th with a huge amount of cool prizes!
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mkwhe
168 posts
mkwhe
#4 h  Apr 6, 2025, 6:06 PM • 2 Y
Y by PikaPika999, GodGodGodGodGoose
20 Days Left Until Applications Due!
Try your hand at cool math problems! Top 50 get merch, Top 20 get cash!
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audio-on
513 posts
audio-on
#5 h  Apr 7, 2025, 8:48 PM • 2 Y
Y by PikaPika999, GodGodGodGodGoose
Very excited that this comp is underway! Again, all girls that are US Citizens in 5th through 8th grade are welcome to participate - completely free to enter.
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mkwhe
168 posts
mkwhe
#6 h  Apr 8, 2025, 12:07 AM • 2 Y
Y by PikaPika999, GodGodGodGodGoose
REMINDER THAT TOP 50 GET NEW MERCH! Try the competition!
Apply here: https://xmathandai4girls.submittable.com/submit
This post has been edited 2 times. Last edited by mkwhe, Apr 8, 2025, 12:07 AM
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christinaa.luu
5 posts
christinaa.luu
#7 h  Apr 8, 2025, 1:13 AM • 2 Y
Y by PikaPika999, GodGodGodGodGoose
Super cool competition with super cool merch and prizes!!!!
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angie.
318 posts
angie.
#8 h  Apr 8, 2025, 8:04 PM • 2 Y
Y by PikaPika999, GodGodGodGodGoose
Just under a few weeks left before submissions close; remember to get started early! Top scorers are invited to join the MA4G team and be a part of the problem writing and outreach process which is always super fun!
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Lightybird
3 posts
Lightybird
#9 h  Apr 9, 2025, 12:16 AM • 3 Y
Y by PikaPika999, mkwhe, GodGodGodGodGoose
For anyone searching for past problems. Here's a link to past competitions: Click here
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fishchips
4 posts
fishchips
#10 h  Apr 9, 2025, 8:53 PM • 1 Y
Y by GodGodGodGodGoose
how long should the essays be? also, are there any particular qualities that you're looking for (e.g., passion or leadership)?
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myzaops
72 posts
myzaops
#11 h  Apr 10, 2025, 9:45 PM • 1 Y
Y by GodGodGodGodGoose
The essays should be up to 400 words long! Things like leadership, passion, and creativity are all good to have.
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mkwhe
168 posts
mkwhe
#12 h  Apr 11, 2025, 5:33 PM • 1 Y
Y by GodGodGodGodGoose
fishchips wrote:
how long should the essays be? also, are there any particular qualities that you're looking for (e.g., passion or leadership)?

Also, don't remember to cite sources if you need used them. You got this!
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mathandai
4 posts
mathandai
#13 h  Apr 11, 2025, 6:35 PM • 1 Y
Y by GodGodGodGodGoose
You still have over two weeks to complete the application!!
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mkwhe
168 posts
mkwhe
#14 h  Apr 11, 2025, 9:41 PM • 1 Y
Y by GodGodGodGodGoose
If you are a girl from 5th-8th grade, please sign up for this math competition! Math and AI 4 Girls

Complete a 12 question problem set on math and computer science/AI related topics (just pseudocode, it's super easy!) and write two short essays to win up to $1000 dollars in cash and over 50 dollars in merch!

Apply here: https://xmathandai4girls.submittable.com/submit
This post has been edited 3 times. Last edited by mkwhe, Apr 11, 2025, 9:43 PM
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Roryhu
3 posts
Roryhu
#15 h  Apr 12, 2025, 5:44 PM • 1 Y
Y by GodGodGodGodGoose
Thank you for organizing this competition! I participated last year and I remember that there was really great merch—there's still two weeks to submit, don't miss out on this opportunity!
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REACHAW
7 posts
REACHAW
#16 h  Apr 13, 2025, 5:48 PM • 1 Y
Y by GodGodGodGodGoose
Can people outside the US participate?
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mkwhe
168 posts
mkwhe
#17 h  Apr 14, 2025, 1:44 PM • 1 Y
Y by GodGodGodGodGoose
You can, but we will be unable to mail you your merch and certificate. We can always try to work around that, but that's the worst case scenario.
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REACHAW
7 posts
REACHAW
#18 h  Apr 14, 2025, 11:38 PM
Y by
Great! I heard you had an info session? Where can I find the link?
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EvaLin
6 posts
EvaLin
#20 h  Apr 16, 2025, 5:43 AM
Y by
do i have to finish all the problems to submit?
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mkwhe
168 posts
mkwhe
#21 h  Apr 16, 2025, 3:05 PM
Y by
EvaLin wrote:
do i have to finish all the problems to submit?

Nope! Just do as much as you can and submit!
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fishchips
4 posts
fishchips
#22 h  Apr 18, 2025, 3:58 PM
Y by
There is about a week left before the submission deadline. Please make sure to submit before April 26th 11:59 PM EST!

We give a lot of prizes in addition to our cash prizes and merchandise for top scorers. Last year, we gave the Passion Award (additional $50 cash prize and certificate) to the student who submitted first, as well as Rising Star Awards for 5th and 6th graders who were not in the top 50 overall but impressed judges by showing tremendous promise.
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mkwhe
168 posts
mkwhe
#23 h  Apr 19, 2025, 11:33 PM
Y by
JOIN OUR DISCORD FOR ANY UPDATES, FAQs, AND ANNOUNCEMENTS: https://discord.com/channels/1188231285521535006/1188234090739150950
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SmartGroot
2787 posts
SmartGroot
#24 h  Apr 19, 2025, 11:35 PM
Y by
how'd the high schooler's land the leadership positions here:

https://www.mathandai4girls.org/our-team

Also you'd you partner and sponsor with companies as a high school runned company
https://www.mathandai4girls.org
This post has been edited 1 time. Last edited by SmartGroot, Apr 19, 2025, 11:37 PM
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mkwhe
168 posts
mkwhe
#25 h  Apr 19, 2025, 11:46 PM
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Entries are due in ONE WEEK!
Just a reminder that you can still get partial credit for questions even if you get it wrong! Make sure to submit it, though, so that you can get the credit in the first place! For example, if you show your thought process or get to a certain valuable step in your explanation, you can get points for this!
https://xmathandai4girls.submittable.com/submit
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fishchips
4 posts
fishchips
#26 h  Apr 19, 2025, 11:59 PM
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yep, don't stress about not fully solving all the problems! it's very rare for contestants to get full marks on the problem set.
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WhitePhoenix
41 posts
WhitePhoenix
#27 h  Apr 23, 2025, 3:54 PM
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As a reminder, there are only about 3 days left before the submission deadline. Please make your final revisions in the next day or two and submit! There is a limit to the number of submissions we can take.
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mirzakhani12
4 posts
mirzakhani12
#28 h  Wednesday at 10:53 PM
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The problems are so cool, and this competition is very exciting! How important are the essays in the application, and what general qualities should be mentioned?
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Panda729
158 posts
Panda729
#29 h  Wednesday at 10:56 PM
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Ooooo interesting! :w00tb:
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WhitePhoenix
41 posts
WhitePhoenix
#30 h  Yesterday at 4:06 PM
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mirzakhani12 wrote:
The problems are so cool, and this competition is very exciting! How important are the essays in the application, and what general qualities should be mentioned?

Great question! Essays are important, as they show the judges the true character of the applicant. Essays, however, are not weighted as highly as the problem set. For the first essay, you could mention your math competition journey and your reflections on STEM as a result of your experiences. For the second essay, you can be as creative as you want!
This post has been edited 1 time. Last edited by WhitePhoenix, Yesterday at 4:06 PM
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WhitePhoenix
41 posts
WhitePhoenix
#31 h  5 hours ago
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IMPORTANT ANNOUNCEMENT: We are extending the competition by one week. The new submission deadline is 5/3/25 at 11:59 PM EST. Please make sure to submit by then. That is the hard deadline.
This post has been edited 1 time. Last edited by WhitePhoenix, 4 hours ago
Reason: Typo
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