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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]
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0 replies
jlacosta
May 1, 2025
0 replies
Docked 4 points Help
sadas123   7
N a few seconds ago by jellybeanzzz
In school we had this beginners like middle school contest, but we had to right down our solution kind of like usajmo except no proofs. It was also graded out of 7 but I got 4 Points docked for this question. what was my problem??? But I kind of had to rush the solution on this question because there was another problem before this that was like 1000x times harder.

Question:The solutions to the equation x^3-13x^2+ax−48=0 are all positive whole numbers. What is $a$?


Solution: We can see that we can use Vieta's formulas to find that the product of the roots is $48$, and the sum of the roots is $13$. So we need to find a combination of integers that multiply to $48$ and add up to $13$. Let's call the roots of the equation p, q, and r. From Vieta's, we get that $p+q+r=-13$ and $pqr = -48$. Looking at the factors of $48$, which is $2^4*3$, we try to split the numbers in a way that gives us the correct sum and product. Trying 3, -2, and -8, we see that they add up to $-13$ and multiply to $-48$, so they work. That means the roots of the polynomial are -3, -2, and -8, and the factorization is $(x-3)(x-2)(x-8)$. Multiplying it out, we get $x^3-13x^2+46x-48$, so we find that a = 46.
7 replies
2 viewing
sadas123
4 hours ago
jellybeanzzz
a few seconds ago
You are invited to BROOM 2025!
puffypundo   7
N 2 minutes ago by Yihangzh
You are invited to BROOM 2025!

BROOM (Building Resolve and Opportunity for Oncoming MOPpers) is a collaborative, highly intensive online math program modeled after MOP, open to students entering 9th grade and above. The program is designed by many past and current MOPpers to bring the MOP experience to everyone. It will take place from June 11th to July 2nd for 6 to 10 hours a day, with activities running in perfect parallel with MOP.

The program will include a structured schedule of student-led classes, mock tests, and community events to get to know your fellow sweepers. Just like MOP this year, there will be 3 practice tests, 2 ELMO-style tests, and 3 TSTST-style tests. Classes will range in difficulty, and more details regarding color groups and tests will be sent to students who register.

To achieve a more immersive experience, BROOM will be hosted on a Minecraft server where players can interact just like in real life, featuring classrooms for classes, lecture halls for tests, and dorms/dining halls for fun! Proximity chat will also be installed to imitate in-person conversation.

For over 150 hours of activities, the program is only $90, and financial aid is available. A copy of Minecraft will be included with your registration. Note that we do not run for profit - all funds are used for running the program itself.

Join our Discord and register for BROOM by June 1st! Extra details are available here. :D

Note

7 replies
+1 w
puffypundo
an hour ago
Yihangzh
2 minutes ago
9 best high school math competitions hosted by a college/university
ethan2011   21
N 20 minutes ago by linjiah
I only included college-hosted comps since MAA comps are very differently formatted, and IMO would easily beat the rest on quality since mathematicians around the world give questions, and so many problems are shortlisted, so IMO does release the IMO shortlist for people to practice. I also did not include the not as prestigious ones(like BRUMO, CUBRMC, and others), since most comps with very high quality questions are more prestigious(I did include other if you really think those questions are really good).
21 replies
ethan2011
Apr 12, 2025
linjiah
20 minutes ago
[CASH PRIZES] IndyINTEGIRLS Spring Math Competition
Indy_Integirls   18
N an hour ago by Inaaya
[center]IMAGE

Greetings, AoPS! IndyINTEGIRLS will be hosting a virtual math competition on May 25,
2024 from 12 PM to 3 PM EST.
Join other woman-identifying and/or non-binary "STEMinists" in solving problems, socializing, playing games, winning prizes, and more! If you are interested in competing, please register here![/center]

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[center]Important Information[/center]

Eligibility: This competition is open to all woman-identifying and non-binary students in middle and high school. Non-Indiana residents and international students are welcome as well!

Format: There will be a middle school and high school division. In each separate division, there will be an individual round and a team round, where students are grouped into teams of 3-4 and collaboratively solve a set of difficult problems. There will also be a buzzer/countdown/Kahoot-style round, where students from both divisions are grouped together to compete in a MATHCOUNTS-style countdown round! There will be prizes for the top competitors in each division.

Problem Difficulty: Our amazing team of problem writers is working hard to ensure that there will be problems for problem-solvers of all levels! The middle school problems will range from MATHCOUNTS school round to AMC 10 level, while the high school problems will be for more advanced problem-solvers. The team round problems will cover various difficulty levels and are meant to be more difficult, while the countdown/buzzer/Kahoot round questions will be similar to MATHCOUNTS state to MATHCOUNTS Nationals countdown round in difficulty.

Platform: This contest will be held virtually through Zoom. All competitors are required to have their cameras turned on at all times unless they have a reason for otherwise. Proctors and volunteers will be monitoring students at all times to prevent cheating and to create a fair environment for all students.

Prizes: At this moment, prizes are TBD, and more information will be provided and attached to this post as the competition date approaches. Rest assured, IndyINTEGIRLS has historically given out very generous cash prizes, and we intend on maintaining this generosity into our Spring Competition.

Contact & Connect With Us: Follow us on Instagram @indy.integirls, join our Discord, follow us on TikTok @indy.integirls, and email us at indy@integirls.org.

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[center]Help Us Out

Please help us in sharing the news of this competition! Our amazing team of officers has worked very hard to provide this educational opportunity to as many students as possible, and we would appreciate it if you could help us spread the word!
18 replies
Indy_Integirls
May 11, 2025
Inaaya
an hour ago
Double integration
Tricky123   1
N Today at 4:44 AM by greenturtle3141
Q)
\[\iint_{R} \sin(xy) \,dx\,dy, \quad R = \left[0, \frac{\pi}{2}\right] \times \left[0, \frac{\pi}{2}\right]\]
How to solve the problem like this I am using the substitution method but its seems like very complicated in the last
Please help me
1 reply
Tricky123
Today at 3:51 AM
greenturtle3141
Today at 4:44 AM
Proving a group is abelian
dragosgamer12   9
N Today at 12:43 AM by ysharifi
Source: Florin Stanescu, Gazeta Matematica seria B Nr.2/2025
Let $(G,\cdot)$ be a group, $K$ a subgroup of $G$ and $f : G \rightarrow G$ an endomorphism with the following property:
There exists a nonempty set $H\subset	G$ such that for any $k \in G \setminus K$ there exist $h  \in H$ with $f(h)=k$ and $z \cdot h= h \cdot z$, for any $z \in H$.

a)Prove that $(G, \cdot)$ is abelian.
b)If, additionally, $H$ is a subgroup of $G$, prove that $H=G$
9 replies
dragosgamer12
May 15, 2025
ysharifi
Today at 12:43 AM
Convergence of complex sequence
Rohit-2006   0
Yesterday at 7:56 PM
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,
$$z_1=z_2=\cdots=z_k=1$$.
0 replies
Rohit-2006
Yesterday at 7:56 PM
0 replies
Problem on distinct prime divisors of P(1),...,P(n)
IAmTheHazard   3
N Yesterday at 7:04 PM by IAmTheHazard
Find all nonnegative real numbers $\lambda$ such that there exists an integer polynomial $P$ with no integer roots and a constant $c>0$ such that
$$\prod_{i=1}^n P(i)=P(1)\cdot P(2)\cdots P(n)$$has at least $cn^{\lambda}$ distinct prime divisors for all positive integers $n$.
3 replies
IAmTheHazard
Apr 4, 2025
IAmTheHazard
Yesterday at 7:04 PM
Invertible Matrices
Mateescu Constantin   7
N Yesterday at 6:27 PM by CHOUKRI
Source: Romanian District Olympiad 2018 - Grade XI - Problem 1
Show that if $n\ge 2$ is an integer, then there exist invertible matrices $A_1, A_2, \ldots, A_n \in \mathcal{M}_2(\mathbb{R})$ with non-zero entries such that:

\[A_1^{-1} + A_2^{-1} + \ldots + A_n^{-1} = (A_1 + A_2 + \ldots + A_n)^{-1}.\]
Edit.
7 replies
Mateescu Constantin
Mar 10, 2018
CHOUKRI
Yesterday at 6:27 PM
A challenging sum
Polymethical_   2
N Yesterday at 6:19 PM by GreenKeeper
I tried to integrate series of log(1-x) / x
2 replies
Polymethical_
Yesterday at 4:09 AM
GreenKeeper
Yesterday at 6:19 PM
Analytic on C excluding countably many points
Omid Hatami   12
N Yesterday at 6:13 PM by alinazarboland
Source: IMS 2009
Let $ A\subset \mathbb C$ be a closed and countable set. Prove that if the analytic function $ f: \mathbb C\backslash A\longrightarrow \mathbb C$ is bounded, then $ f$ is constant.
12 replies
Omid Hatami
May 20, 2009
alinazarboland
Yesterday at 6:13 PM
2022 Putnam A2
giginori   20
N Yesterday at 6:06 PM by dragoon
Let $n$ be an integer with $n\geq 2.$ Over all real polynomials $p(x)$ of degree $n,$ what is the largest possible number of negative coefficients of $p(x)^2?$
20 replies
giginori
Dec 4, 2022
dragoon
Yesterday at 6:06 PM
fibonacci number theory
FFA21   1
N Yesterday at 2:53 PM by alexheinis
Source: OSSM Comp'25 P3 (HSE IMC qualification)
$F_n$ fibonacci numbers ($F_1=1, F_2=1$) find all n such that:
$\forall i\in Z$ and $0\leq i\leq F_n$
$C^i_{F_n}\equiv (-1)^i\pmod{F_n+1}$
1 reply
FFA21
May 14, 2025
alexheinis
Yesterday at 2:53 PM
Tough integral
Martin.s   3
N Friday at 9:42 PM by GreenKeeper
$$\int_0^{\pi/2}\ln(\tan(\theta/2))
\;\frac{4\cos\theta\cos(2\theta)}{4\sin^4\theta+1}\,d\theta.$$
3 replies
Martin.s
May 12, 2025
GreenKeeper
Friday at 9:42 PM
Help with math problem
Cizt6464   0
Apr 18, 2025
Source: https://math.mosolymp.ru/upload/files/2018/khamovniki/7/2017-10-07_Kombinatorika.pdf
Given six distinct points on a plane, all pairwise distances between which are different. Prove that there exists a line segment connecting two of these points which is the longest side in one triangle formed by three of the points, and the shortest side in another triangle formed by three of the points.
0 replies
Cizt6464
Apr 18, 2025
0 replies
Help with math problem
G H J
Source: https://math.mosolymp.ru/upload/files/2018/khamovniki/7/2017-10-07_Kombinatorika.pdf
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Given six distinct points on a plane, all pairwise distances between which are different. Prove that there exists a line segment connecting two of these points which is the longest side in one triangle formed by three of the points, and the shortest side in another triangle formed by three of the points.
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