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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.
[*]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
jlacosta
May 1, 2025
0 replies
All Topics Marked
alpha31415   8
N 38 minutes ago by miles888
Excuse me!
for I am a frashman in aops.I wonder how I could get back to mark all my read.All topics in the forum became as if they had been marked.Would someone please help me deal with it???
8 replies
alpha31415
May 16, 2025
miles888
38 minutes ago
Introducing myself at AoPS, and what's your magic wand?
asuth_asuth   1249
N 4 hours ago by BlackShark28
Hi!

I'm Andrew Sutherland. I'm the new Chief Product Officer at AoPS. As you may have read, Richard is retiring and Ben Kornell and I are working together to lead the company now. I'm leading all the software and digital stuff at AoPS. I just wanted to say hello and introduce myself! I'm really excited to be part of the special community that is AoPS.

Previously, I founded Quizlet as a 15-year-old high school student. I did Course 6 at MIT and then left to lead Quizlet full-time for a total of 14 years. I took a few years off and now I'm doing AoPS! I wrote more about all that on my blog: https://asuth.com/im-joining-aops

I have a question for all of you. If you could wave a magic wand, and change anything about AoPS, what would it be? All suggestions welcome! Thank you.
1249 replies
1 viewing
asuth_asuth
Mar 30, 2025
BlackShark28
4 hours ago
The matrix in some degree is a scalar
FFA21   4
N Today at 12:06 PM by FFA21
Source: MSU algebra olympiad 2025 P2
$A\in M_{3\times 3}$ invertible, for an infinite number of $k$:
$tr(A^k)=0$
Is it true that $\exists n$ such that $A^n$ is a scalar
4 replies
1 viewing
FFA21
Today at 12:11 AM
FFA21
Today at 12:06 PM
Prove the statement
Butterfly   10
N Today at 10:16 AM by oty
Given an infinite sequence $\{x_n\} \subseteq  [0,1]$, there exists some constant $C$, for any $r>0$, among the sequence $x_n$ and $x_m$ could be chosen to satisfy $|n-m|\ge r $ and $|x_n-x_m|<\frac{C}{|n-m|}$.
10 replies
Butterfly
May 7, 2025
oty
Today at 10:16 AM
Definite integration
girishpimoli   1
N Today at 9:34 AM by Mathzeus1024
If $\displaystyle g(t)=\int^{t^{2}}_{2t}\cot^{-1}\bigg|\frac{1+x}{(1+t)^2-x}\bigg|dx.$ Then $\displaystyle \frac{g(5)}{g(3)}$ is
1 reply
girishpimoli
Apr 6, 2025
Mathzeus1024
Today at 9:34 AM
Weird integral
Martin.s   0
Today at 9:33 AM
\[
\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}} 
\frac{1 - e^{-2} \cos\left(2\left(u + \tan u\right)\right)}
{1 - 2e^{-2} \cos\left(2\left(u + \tan u\right)\right) + e^{-4}} 
\, \mathrm{d}u
\]
0 replies
Martin.s
Today at 9:33 AM
0 replies
hard number theory problem
danilorj   4
N Today at 9:01 AM by c00lb0y
Let \( a \) and \( b \) be positive integers. Prove that
\[
a^2 + \left\lceil \frac{4a^2}{b} \right\rceil
\]is not a perfect square.
4 replies
danilorj
May 18, 2025
c00lb0y
Today at 9:01 AM
Unsolving differential equation
Madunglecha   2
N Today at 8:44 AM by vanstraelen
For parameter t
I made a differential equation :
y"=y*(x')^2
for here, '&" is derivate and second order derivate for t
could anyone tell me what is equation between y&x?
2 replies
Madunglecha
May 18, 2025
vanstraelen
Today at 8:44 AM
maximum dimention of non-singular subspace
FFA21   1
N Today at 8:27 AM by alexheinis
Source: MSU algebra olympiad 2025 P1
We call a linear subspace in the space of square matrices non-singular if all matrices contained in it, except for the zero one, are non-singular. Find the maximum dimension of a non-singular subspace in the space of
a) complex $n\times n$ matrices
b) real $4\times 4$ matrices
c) rational $n\times n$ matrices
1 reply
FFA21
Today at 12:02 AM
alexheinis
Today at 8:27 AM
functional equation
pratyush   4
N Today at 8:00 AM by Mathzeus1024
For the functional equation $f(x-y)=\frac{f(x)}{f(y)}$, if f ' (0)=p and f ' (5)=q, then prove f ' (-5) = q
4 replies
pratyush
Apr 4, 2014
Mathzeus1024
Today at 8:00 AM
a product that is never a square
FFA21   1
N Today at 7:21 AM by ohiorizzler1434
Source: MSU algebra olympiad 2025 P3
Show that the product $7*77*777*7777*77777...$ is never a square of an integer.
1 reply
FFA21
Today at 12:18 AM
ohiorizzler1434
Today at 7:21 AM
Convergence of complex sequence
Rohit-2006   8
N Today at 7:12 AM by ohiorizzler1434
Suppose $z_1, z_2,\cdots,z_k$ are complex numbers with absolute value $1$. For $n=1,2,\cdots$ define $w_n=z_1^n+z_2^n+\cdots+z_k^n$. Given that the sequence $(w_n)_{n\geq1}$ converges. Show that,
$$z_1=z_2=\cdots=z_k=1$$.
8 replies
Rohit-2006
May 17, 2025
ohiorizzler1434
Today at 7:12 AM
k alcumus going crazy?
LittleSnake____   61
N Yesterday at 4:40 PM by jlacosta
all of a sudden, the alcumus forum has gotten completely exploded by gamebot's posts.

https://artofproblemsolving.com/community/c63h3570498_alcumus_going_crazy
61 replies
LittleSnake____
May 18, 2025
jlacosta
Yesterday at 4:40 PM
k New user not allowed to use LaTeX
Cats_on_a_computer   8
N Yesterday at 6:04 AM by Cats_on_a_computer
Do I seriously have to post everyday for 14 days for me not to be considered a “new user? I didn’t even upload any images, I just used LaTeX. How am I supposed to write anything without LaTeX?
8 replies
1 viewing
Cats_on_a_computer
May 18, 2025
Cats_on_a_computer
Yesterday at 6:04 AM
k User number of posts status error
XAN4   5
N Feb 22, 2025 by bpan2021
Today I was browsing the forum High School Olympiads. There's a user whose username is the_universe6626, but then, when I flicked down to browse earlier answers today(note: I didn't 'search for this user's posts'), I found that one of them was labeled '23 posts'. I browsed his earlier answers today, and the number of posts increases, from 25 posts in the morning all the way to 36 posts right now. Is this a feature or a bug? If it is a feature, then certainly I haven't seen it elsewhere.
5 replies
XAN4
Feb 21, 2025
bpan2021
Feb 22, 2025
User number of posts status error
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XAN4
60 posts
#1
Y by
Today I was browsing the forum High School Olympiads. There's a user whose username is the_universe6626, but then, when I flicked down to browse earlier answers today(note: I didn't 'search for this user's posts'), I found that one of them was labeled '23 posts'. I browsed his earlier answers today, and the number of posts increases, from 25 posts in the morning all the way to 36 posts right now. Is this a feature or a bug? If it is a feature, then certainly I haven't seen it elsewhere.
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Demetri
1379 posts
#2
Y by
Today I was browsing the forum High School Olympiads. There's a user whose username is the_universe6626, but then, when I flicked down to browse earlier answers today(note: I didn't 'search for this user's posts'), I found that one of them was labeled '23 posts'. I browsed his earlier answers today, and the number of posts increases, from 25 posts in the morning all the way to 36 posts right now. Is this a feature or a bug? If it is a feature, then certainly I haven't seen it elsewhere.
Refresh maybe? I cannot reproduce.
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KangarooPrecise
1271 posts
#3
Y by
Maybe he/she posted a lot?
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bpan2021
2662 posts
#4 • 1 Y
Y by Demetri
It shouldn't be a feature. It may be because of the fact that they have posted 11 posts during the time you were looking through the threads.
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XAN4
60 posts
#5
Y by
bpan2021 wrote:
It shouldn't be a feature. It may be because of the fact that they have posted 11 posts during the time you were looking through the threads.
That shouldn't be true, because I logged in at 9 pm, and the earlier post at 7 am or something shows he/she posted 23, and the latest 36.
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bpan2021
2662 posts
#6
Y by
The post count of a user goes up whenever they post in specific forums. (Other forums do not count towards post count, but this idea is besides the point.)

It's possible that: your cache from a previous session carried over, and the post number from that user didn't refresh when you first viewed this user's post number, and it refreshed when you viewed the post count the second time.

Or, the user you were looking at posted between the first time you viewed their post count and the second time you viewed their post count, so their post count updated.

If the issue you're having isn't the one I'm explaining, please clarify.
This post has been edited 3 times. Last edited by bpan2021, Feb 22, 2025, 2:42 AM
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