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Tech support and questions about AoPS classes and materials
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Site Support Tech support and questions about AoPS classes and materials
Tech support and questions about AoPS classes and materials
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k a July Highlights and 2025 AoPS Online Class Information
jwelsh   0
Jul 1, 2025
We are halfway through summer, so be sure to carve out some time to keep your skills sharp and explore challenging topics at AoPS Online and our AoPS Academies (including the Virtual Campus)!

[list][*]Over 60 summer classes are starting at the Virtual Campus on July 7th - check out the math and language arts options for middle through high school levels.
[*]At AoPS Online, we have accelerated sections where you can complete a course in half the time by meeting twice/week instead of once/week, starting on July 8th:
[list][*]MATHCOUNTS/AMC 8 Basics
[*]MATHCOUNTS/AMC 8 Advanced
[*]AMC Problem Series[/list]
[*]Plus, AoPS Online has a special seminar July 14 - 17 that is outside the standard fare: Paradoxes and Infinity
[*]We are expanding our in-person AoPS Academy locations - are you looking for a strong community of problem solvers, exemplary instruction, and math and language arts options? Look to see if we have a location near you and enroll in summer camps or academic year classes today! New locations include campuses in California, Georgia, New York, Illinois, and Oregon and more coming soon![/list]

MOP (Math Olympiad Summer Program) just ended and the IMO (International Mathematical Olympiad) is right around the corner! This year’s IMO will be held in Australia, July 10th - 20th. Congratulations to all the MOP students for reaching this incredible level and best of luck to all selected to represent their countries at this year’s IMO! Did you know that, in the last 10 years, 59 USA International Math Olympiad team members have medaled and have taken over 360 AoPS Online courses. Take advantage of our Worldwide Online Olympiad Training (WOOT) courses
and train with the best! Please note that early bird pricing ends August 19th!
Are you tired of the heat and thinking about Fall? You can plan your Fall schedule now with classes at either AoPS Online, AoPS Academy Virtual Campus, or one of our AoPS Academies around the US.

Our full course list for upcoming classes is below:
All classes start 7:30pm ET/4:30pm PT unless otherwise noted.

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0 replies
jwelsh
Jul 1, 2025
0 replies
advertisment
garfield0515   6
N 5 hours ago by garfield0515
I got a pm saying that one of my previous posts about advertising was removed and I just learned that it was not allowed, and there may be further reports and it would be great if you could excuse those since I just learned that.
please send me a pm or something
garfield0515
6 replies
garfield0515
Yesterday at 9:32 PM
garfield0515
5 hours ago
f(D(x)), inf f(x) and sup f(x)
aktyw19   1
N Today at 10:56 AM by Mathzeus1024
find f(D(x)), inf f(x) and sup f(x)
$ f(x) = \{\begin{array}{cc}\sqrt {x}\cdot\arctan\frac {1}{x}\mbox { dla } x > 0 \\
0\mbox{ dla } x = 0 \end{array}$
where D(x)-domain f
1 reply
aktyw19
Mar 23, 2010
Mathzeus1024
Today at 10:56 AM
Today's calculation of Integral 599
Kunihiko_Chikaya   6
N Today at 7:52 AM by aaravdodhia
Evaluate $\int_0^{\frac{\pi}{6}} \frac{e^x(\sin x+\cos x+\cos 3x)}{\cos^ 2 {2x}}\ dx$.

created by kunny
6 replies
Kunihiko_Chikaya
Apr 27, 2010
aaravdodhia
Today at 7:52 AM
sequence
am_11235...   3
N Today at 5:24 AM by Alphaamss
Let $f:[a,b]\to [a,b]$ be a function such that $|f(x)-f(y)|\leq |x-y|$ for all $x,y\in [a,b]$. Prove that the sequence $\{x_n\}$ defined by $x_{n+1}=\frac{x_n+f(x_n)}{2}$ converges to a fixed point of $f$.
3 replies
am_11235...
Mar 19, 2017
Alphaamss
Today at 5:24 AM
Clarification about area of region bounded by curves
pie854   1
N Yesterday at 6:09 PM by greenturtle3141
Suppose we want to find the area of the region defined by $a_1\leq xy\leq a_2$ and $b_1\leq x/y \leq b_2$. Assuming $a_1,b_1>0$, I think there are going to be two such regions with equal area (corresponding to $x,y>0$ and $x,y<0$).

When I use a transition map and change the variables, the value of the integral I get is only half of the actual area (corresponding to $x,y>0$?). So, what I want to know is: is the formula $$\iint_{R} f(x,y) \ dx \ dy=\iint_{R'} f(u,v) |det(J_T)| \ du \ dv$$implicitly assuming there's only one region? And, how do I use it so that it always gives the complete region, without me having to look at the graphs?

P.S. If I let $u=xy$, $v=x/y$ then $(x,y)=(\pm \sqrt{uv}, \pm \sqrt{u/v})$. So, I think I have to consider two maps $T_1(u,v)=(\sqrt{uv},\sqrt{u/v})$ and $T_2(u,v)=(-\sqrt{uv},-\sqrt{u/v})$ and then add up the two integrals $T_1$ and $T_2$ give. Is it alright?
1 reply
pie854
Yesterday at 11:31 AM
greenturtle3141
Yesterday at 6:09 PM
Cannot post PHP
char0221   10
N Yesterday at 5:11 PM by PreciseScorpion58
Summary of the problem: If I try to post anything with PHP (a coding language), it
Page URL: In any forum or private messages
Steps to reproduce:
1. Create a post.
2. Put some PHP inside, can't give example
Expected behavior: Should post the message
Frequency: 100%
Operating system(s): macOS Sequoia 15.2.1
Browser(s), including version: Safari
Additional information: See attachments
10 replies
char0221
Apr 30, 2025
PreciseScorpion58
Yesterday at 5:11 PM
a sufficient condition for nilpotence
CatalinBordea   3
N Yesterday at 4:26 PM by Filipjack
Source: Romanian District Olympiad 2015, Grade XII, Problem 4
Let $ m $ be a non-negative ineger, $ n\ge 2 $ be a natural number, $ A $ be a ring which has exactly $ n $ elements, and an element $ a $ of $ A $ such that $ 1-a^k $ is invertible, for all $ k\in\{ m+1,m+2,...,m+n-1\} . $
Prove that $ a $ is nilpotent.
3 replies
CatalinBordea
Sep 26, 2018
Filipjack
Yesterday at 4:26 PM
Processing module python not working
Demetri   11
N Yesterday at 4:15 PM by PikaPika999
The following code doesn't work, because canvas isn't implemented for the processing module:
import processing
def setup():
    processing.size(200, 200)
def draw():
    processing.ellipse(100, 100, 50, 50)
    processing.noLoop()
processing.run()

I believe this is an easy fix, someone just forgot to add the line "Sk.canvas = outcanvas;"(or something similar) in the code for the pywindow, which would give an output.
11 replies
Demetri
Jul 1, 2025
PikaPika999
Yesterday at 4:15 PM
Need Urgent Guidance to Switch from B.Tech CSE to Math Abroad (India)
ThalapathyMath   0
Yesterday at 4:13 PM
Source: need advice
Hi everyone,
I’m Shreyan Raj, 18, from India. I’m in B.Tech CSE right now, but I’ve realized my true passion is pure mathematics. I even learned basic C and Python before reaching this decision — so this isn’t sudden. I love problem-solving, logic, derivations — not programming.

I scored 295/300 in math in 12th grade, and I want to apply for a BSc math degree abroad, preferably in affordable countries like Russia, Czech Republic, Germany, etc.

But I’m facing:

1. Family pressure not to drop or switch

2. Financial struggles (can’t afford big application fees)

3. I only have soft copies of documents

4. This July is my only chance, but I also have internal exams

Can anyone here suggest:

1. Universities that accept soft docs?

2. Anyone who did something similar?

3. How to explain to parents or find support?

Even small advice means a lot right now. Thank you in advance
— Shreyan Raj

0 replies
ThalapathyMath
Yesterday at 4:13 PM
0 replies
A^2+B^2=AB+BA
mathisreal   1
N Yesterday at 10:50 AM by loup blanc
Source: OIMU 2023 #4
Determine all pairs of real matrices $(A,B)$ of size $2\times 2$ with $A\neq B$ such that
\[A^2+B^2=AB+BA=2I\]
1 reply
mathisreal
Yesterday at 12:03 AM
loup blanc
Yesterday at 10:50 AM
ISI UGB 2025 P3
SomeonecoolLovesMaths   14
N Yesterday at 10:10 AM by Cats_on_a_computer
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 $x$.
14 replies
SomeonecoolLovesMaths
May 11, 2025
Cats_on_a_computer
Yesterday at 10:10 AM
ISI UGB 2025 P1
SomeonecoolLovesMaths   10
N Yesterday at 8:03 AM by Cats_on_a_computer
Source: ISI UGB 2025 P1
Suppose $f \colon \mathbb{R} \longrightarrow \mathbb{R}$ is differentiable and $| f'(x)| < \frac{1}{2}$ for all $x \in \mathbb{R}$. Show that for some $x_0 \in \mathbb{R}$, $f \left( x_0 \right) = x_0$.
10 replies
SomeonecoolLovesMaths
May 11, 2025
Cats_on_a_computer
Yesterday at 8:03 AM
AoPS Wiki being really slow
SwordAxe   2
N Yesterday at 2:53 AM by SwordAxe
Summary of the problem: AoPS wiki is being really slow, when I'm loading up amc 10 questions it takes around 30 seconds to load, but other parts of the site aren't slow
Page URL: aopswiki
Steps to reproduce:
1. go onto aops wiki and searh an amc 10 question or any type of question or page

Expected behavior: being slow
Frequency: almost always, sometimes it loads fast
Operating system(s): Windows 10
Browser(s), including version: newest microsoft edge
Additional information:
2 replies
SwordAxe
Yesterday at 2:29 AM
SwordAxe
Yesterday at 2:53 AM
2024 Putnam A1
KevinYang2.71   23
N Yesterday at 12:05 AM by megahertz13
Determine all positive integers $n$ for which there exists positive integers $a$, $b$, and $c$ satisfying
\[
2a^n+3b^n=4c^n.
\]
23 replies
KevinYang2.71
Dec 10, 2024
megahertz13
Yesterday at 12:05 AM
Cannot post PHP
G H J
G H BBookmark kLocked kLocked NReply
The post below has been deleted. Click to close.
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char0221
170 posts
#1 • 1 Y
Y by PikaPika999
Summary of the problem: If I try to post anything with PHP (a coding language), it
Page URL: In any forum or private messages
Steps to reproduce:
1. Create a post.
2. Put some PHP inside, can't give example
Expected behavior: Should post the message
Frequency: 100%
Operating system(s): macOS Sequoia 15.2.1
Browser(s), including version: Safari
Additional information: See attachments
Attachments:
Z K Y
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Demetri
1573 posts
#2 • 1 Y
Y by PikaPika999
Whoops I messed up trying to show an example and crashed a page :(
I have noticed this as well,
Try to post
systeem.initialize_user(username)
without the double e :)

@3below he's just active
This post has been edited 1 time. Last edited by Demetri, May 2, 2025, 12:02 PM
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bpan2021
2706 posts
#3 • 2 Y
Y by Demetri, PikaPika999
I believe it is because it is a safety mechanism by the servers running the site to prevent any malicious behavior. Just a hunch, though.
Z K Y
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Mango247
1000043 posts
#4 • 6 Y
Y by Mycatisleo, Demetri, ShrewdBunny, AlienGirl05, PikaPika999, PreciseScorpion58
Just tried it
It thinks you are trying to do a cross site scripting attack so cloudfare blocks you
Z K Y
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k1glaucus
694 posts
#8 • 2 Y
Y by PikaPika999, PreciseScorpion58
Post #5

I believe site admins do not appear on the member list.
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CurlyFalcon55
1397 posts
#10 • 1 Y
Y by PikaPika999
Can reproduce. :)
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DynamicBoa76
8 posts
#11 • 1 Y
Y by PikaPika999
Just wait 10 seconds. Done. Maybe I am wrong?? :wacko: :wacko: :wacko: :huuh:
This post has been edited 3 times. Last edited by DynamicBoa76, Yesterday at 12:36 PM
Reason: 2 edits Imao
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PreciseScorpion58
363 posts
#12 • 1 Y
Y by PikaPika999
k1glaucus wrote:
Post #5

I believe site admins do not appear on the member list.

I think he has a bot.
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DynamicBoa76
8 posts
#13 • 1 Y
Y by PikaPika999
PreciseScorpion58 wrote:
k1glaucus wrote:
Post #5

I believe site admins do not appear on the member list.

I think he has a bot.

Maybe? :what?: :wacko:
Z K Y
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huolongguo10
1 post
#14 • 3 Y
Y by PikaPika999, PreciseScorpion58, Demetri
This is because uploading PHP on some sites will lead to being hacked...
So the firewall don't allow uploading PHP any more.
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PreciseScorpion58
363 posts
#15 • 1 Y
Y by PikaPika999
huolongguo10 wrote:
This is because uploading PHP on some sites will lead to being hacked...
So the firewall don't allow uploading PHP any more.

Happy fist post huolongguo10!!! :first: :coolspeak: :D :-D :w00t:
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