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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.

Introductory: Grades 5-10

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Prealgebra 2 Self-Paced

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Introduction to Algebra A Self-Paced

Introduction to Algebra A
Sunday, May 11 - Sep 14 (1:00 - 2:30 pm ET/10:00 - 11:30 am PT)
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Introduction to Counting & Probability Self-Paced

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Introduction to Number Theory
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Introduction to Algebra B Self-Paced

Introduction to Algebra B
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Contest Preparation: Grades 6-12

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MATHCOUNTS/AMC 8 Advanced
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AMC 10 Problem Series
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Mon, Tue, Wed & Thurs, Jun 23 - Jun 26 (meets every day of the week!)
0 replies
jlacosta
May 1, 2025
0 replies
Prove the statement
Butterfly   3
N 4 hours ago by Photaesthesia
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 $|x_n-x_m|<\frac{C}{|n-m|}$.
3 replies
Butterfly
May 7, 2025
Photaesthesia
4 hours ago
Tough integral
Martin.s   1
N 6 hours ago by Martin.s
$$\int_0^{\pi/2}\ln(\tan(\theta/2))
\;\frac{4\cos\theta\cos(2\theta)}{4\sin^4\theta+1}\,d\theta.$$
1 reply
Martin.s
May 12, 2025
Martin.s
6 hours ago
Glitch or Bug?
awesometriangles   5
N Today at 4:18 AM by Craftybutterfly
I was asking for some $\LaTeX$ help in one of my classrooms, and one of the Halpers posted. Is this a glitch or a bug(see screenshot)?


It seems as though I can edit their post...
5 replies
awesometriangles
Today at 1:08 AM
Craftybutterfly
Today at 4:18 AM
Introducing myself at AoPS, and what's your magic wand?
asuth_asuth   1132
N Today at 1:44 AM by ToughGazelle36
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.
1132 replies
asuth_asuth
Mar 30, 2025
ToughGazelle36
Today at 1:44 AM
Calculus
youochange   1
N Yesterday at 1:21 PM by Mathzeus1024
Find the area enclosed by the curves $e^x,e^{-x},x^2+y^2=1$

1 reply
youochange
May 10, 2025
Mathzeus1024
Yesterday at 1:21 PM
Mathematical expectation 1
Tricky123   3
N Yesterday at 1:13 PM by Tricky123
X is continuous random variable having spectrum
$(-\infty,\infty) $ and the distribution function is $F(x)$ then
$E(X)=\int_{0}^{\infty}(1-F(x)-F(-x))dx$ and find the expression of $V(x)$

Ans:- $V(x)=\int_{0}^{\infty}(2x(1-F(x)+F(-x))dx-m^{2}$

How to solve help me
3 replies
Tricky123
May 11, 2025
Tricky123
Yesterday at 1:13 PM
Derivative of unknown continuous function
smartvong   2
N Yesterday at 12:43 PM by solyaris
Source: UM Mathematical Olympiad 2024
Let $f: \mathbb{R} \to \mathbb{R}$ be a function whose derivative is continuous on $[0,1]$. Show that
$$\lim_{n \to \infty} \sum^n_{k = 1}\left[f\left(\frac{k}{n}\right) - f\left(\frac{2k - 1}{2n}\right)\right] = \frac{f(1) - f(0)}{2}.$$
2 replies
smartvong
Yesterday at 1:05 AM
solyaris
Yesterday at 12:43 PM
Divisibility of cyclic sum
smartvong   1
N Yesterday at 12:06 PM by alexheinis
Source: UM Mathematical Olympiad 2024
Let $n$ be a positive integer greater than $1$. Show that
$$4 \mid (x_1x_2 + x_2x_3 + \cdots + x_{n-1}x_n + x_nx_1 - n)$$where each of $x_1, x_2, \dots, x_n$ is either $1$ or $-1$.
1 reply
smartvong
Yesterday at 9:49 AM
alexheinis
Yesterday at 12:06 PM
Polynomial with integer coefficients
smartvong   1
N Yesterday at 10:04 AM by alexheinis
Source: UM Mathematical Olympiad 2024
Prove that there is no polynomial $f(x)$ with integer coefficients, such that $f(p) = \dfrac{p + q}{2}$ and $f(q) = \dfrac{p - q}{2}$ for some distinct primes $p$ and $q$.
1 reply
smartvong
Yesterday at 9:46 AM
alexheinis
Yesterday at 10:04 AM
Existence of scalars
smartvong   0
Yesterday at 9:44 AM
Source: UM Mathematical Olympiad 2024
Let $U$ be a finite subset of $\mathbb{R}$ such that $U = -U$. Let $f,g : \mathbb{R} \to \mathbb{R}$ be functions satisfying
$$g(x) - g(y ) = (x - y)f(x + y)$$for all $x,y \in \mathbb{R} \backslash U$.
Show that there exist scalars $\alpha, \beta, \gamma \in \mathbb{R}$ such that
$$f(x) = \alpha x + \beta$$for all $x \in \mathbb{R}$,
$$g(x) = \alpha x^2 + \beta x + \gamma$$for all $x \in \mathbb{R} \backslash U$.
0 replies
smartvong
Yesterday at 9:44 AM
0 replies
Invertible matrices in F_2
smartvong   1
N Yesterday at 9:02 AM by alexheinis
Source: UM Mathematical Olympiad 2024
Let $n \ge 2$ be an integer and let $\mathcal{S}_n$ be the set of all $n \times n$ invertible matrices in which their entries are $0$ or $1$. Let $m_A$ be the number of $1$'s in the matrix $A$. Determine the minimum and maximum values of $m_A$ in terms of $n$, as $A$ varies over $S_n$.
1 reply
smartvong
Yesterday at 12:41 AM
alexheinis
Yesterday at 9:02 AM
ISI UGB 2025 P3
SomeonecoolLovesMaths   13
N Yesterday at 8:29 AM by iced_tea
Source: ISI UGB 2025 P3
Suppose $f : [0,1] \longrightarrow \mathbb{R}$ is differentiable with $f(0) = 0$. If $|f'(x) | \leq f(x)$ for all $x \in [0,1]$, then show that $f(x) = 0$ for all $x$.
13 replies
SomeonecoolLovesMaths
May 11, 2025
iced_tea
Yesterday at 8:29 AM
k Deleting collections
Sadigly   1
N Monday at 8:40 PM by jlacosta
How to delete some collections? I accidently created 2 same collections, and one of them is useless
1 reply
Sadigly
May 11, 2025
jlacosta
Monday at 8:40 PM
k Alcumus Reset
greenplanet2050   7
N Monday at 8:39 PM by jlacosta
I want to reset my Alcumus but it says "You cannot reset your Alcumus data while you are in current AoPS classes."

But I don't have any ongoing AoPs classes and my last class Precalculus already ended.
7 replies
greenplanet2050
May 10, 2025
jlacosta
Monday at 8:39 PM
k New reaper game
Squidget   10
N Mar 27, 2025 by Cerberusman
What does this mean?

Is this a glitch
10 replies
Squidget
Mar 26, 2025
Cerberusman
Mar 27, 2025
New reaper game
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Squidget
433 posts
#1
Y by
What does this mean?

Is this a glitch
Attachments:
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Gabrielle.Esther
650 posts
#2
Y by
if you click on it:
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Aminecraftbear
1433 posts
#3 • 1 Y
Y by skronkmonster
it starts on april first lol
its some kind of prank
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AmethystC
84 posts
#4
Y by
It starts on April Fools day, at 3:00 am. The description is: Is this a reaper game idk. Could be a prank/joke
This post has been edited 1 time. Last edited by AmethystC, Mar 26, 2025, 10:37 PM
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Aminecraftbear
1433 posts
#5
Y by
nah its 3am eastern so it might just be based on midnight pst
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FunnyKoala17
230 posts
#6
Y by
What is reaper
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cookie130
474 posts
#7 • 1 Y
Y by MathPerson12321
bruh if i want to play i cant sleep and will have to play at the cursed time
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rhydon516
566 posts
#9 • 1 Y
Y by c_double_sharp
look up. there's a plane waving a banner saying "gullible."
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Demetri
1374 posts
#10 • 1 Y
Y by Exponent11
look up. there's a plane waving a banner saying "gullible."
No :)
Great time to start a reaper game lol
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skronkmonster
2188 posts
#11 • 1 Y
Y by MathPerson12321
The game will probably disappear precisely on April 1st
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Cerberusman
316 posts
#12 • 2 Y
Y by MathPerson12321, Exponent11
Demetri wrote:
look up. there's a plane waving a banner saying "gullible."
No :)
Great time to start a reaper game lol

the "goodbye richard" reaper game :rotfl:
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