ka April Highlights and 2025 AoPS Online Class Information
jlacosta0
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)!
Prealgebra 1
Sunday, Apr 13 - Aug 10
Tuesday, May 13 - Aug 26
Thursday, May 29 - Sep 11
Sunday, Jun 15 - Oct 12
Monday, Jun 30 - Oct 20
Wednesday, Jul 16 - Oct 29
Introduction to Algebra A
Monday, Apr 7 - Jul 28
Sunday, May 11 - Sep 14 (1:00 - 2:30 pm ET/10:00 - 11:30 am PT)
Wednesday, May 14 - Aug 27
Friday, May 30 - Sep 26
Monday, Jun 2 - Sep 22
Sunday, Jun 15 - Oct 12
Thursday, Jun 26 - Oct 9
Tuesday, Jul 15 - Oct 28
Introduction to Counting & Probability
Wednesday, Apr 16 - Jul 2
Thursday, May 15 - Jul 31
Sunday, Jun 1 - Aug 24
Thursday, Jun 12 - Aug 28
Wednesday, Jul 9 - Sep 24
Sunday, Jul 27 - Oct 19
Introduction to Number Theory
Thursday, Apr 17 - Jul 3
Friday, May 9 - Aug 1
Wednesday, May 21 - Aug 6
Monday, Jun 9 - Aug 25
Sunday, Jun 15 - Sep 14
Tuesday, Jul 15 - Sep 30
Introduction to Algebra B
Wednesday, Apr 16 - Jul 30
Tuesday, May 6 - Aug 19
Wednesday, Jun 4 - Sep 17
Sunday, Jun 22 - Oct 19
Friday, Jul 18 - Nov 14
Introduction to Geometry
Wednesday, Apr 23 - Oct 1
Sunday, May 11 - Nov 9
Tuesday, May 20 - Oct 28
Monday, Jun 16 - Dec 8
Friday, Jun 20 - Jan 9
Sunday, Jun 29 - Jan 11
Monday, Jul 14 - Jan 19
Intermediate: Grades 8-12
Intermediate Algebra
Monday, Apr 21 - Oct 13
Sunday, Jun 1 - Nov 23
Tuesday, Jun 10 - Nov 18
Wednesday, Jun 25 - Dec 10
Sunday, Jul 13 - Jan 18
Thursday, Jul 24 - Jan 22
MATHCOUNTS/AMC 8 Basics
Wednesday, Apr 16 - Jul 2
Friday, May 23 - Aug 15
Monday, Jun 2 - Aug 18
Thursday, Jun 12 - Aug 28
Sunday, Jun 22 - Sep 21
Tues & Thurs, Jul 8 - Aug 14 (meets twice a week!)
MATHCOUNTS/AMC 8 Advanced
Friday, Apr 11 - Jun 27
Sunday, May 11 - Aug 10
Tuesday, May 27 - Aug 12
Wednesday, Jun 11 - Aug 27
Sunday, Jun 22 - Sep 21
Tues & Thurs, Jul 8 - Aug 14 (meets twice a week!)
AMC 10 Problem Series
Friday, May 9 - Aug 1
Sunday, Jun 1 - Aug 24
Thursday, Jun 12 - Aug 28
Tuesday, Jun 17 - Sep 2
Sunday, Jun 22 - Sep 21 (1:00 - 2:30 pm ET/10:00 - 11:30 am PT)
Monday, Jun 23 - Sep 15
Tues & Thurs, Jul 8 - Aug 14 (meets twice a week!)
AMC 10 Final Fives
Sunday, May 11 - Jun 8
Tuesday, May 27 - Jun 17
Monday, Jun 30 - Jul 21
AMC 12 Problem Series
Tuesday, May 27 - Aug 12
Thursday, Jun 12 - Aug 28
Sunday, Jun 22 - Sep 21
Wednesday, Aug 6 - Oct 22
Introduction to Programming with Python
Thursday, May 22 - Aug 7
Sunday, Jun 15 - Sep 14 (1:00 - 2:30 pm ET/10:00 - 11:30 am PT)
Tuesday, Jun 17 - Sep 2
Monday, Jun 30 - Sep 22
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][/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 , do not answer with " is a solution" only. Either you post any kind of proof or at least something unexpected (like " is the smallest solution). Someone that does not see that 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.
Say that on the AMC 10, you do better on the A than the B, but you still qualify for AIME thru both. Then after your AIME, it turns out that you didn’t make JMO through the A+AIME index but you did pass the threshold for the B+AIME index.
does MAA consider your B+AIME index over the A+AIME index and consider you a JMO qualifier even tho Your A test score was higher?
2025 Math and AI 4 Girls Competition: Win Up To $1,000!!!
audio-on55
N40 minutes ago
by eyzMath
Join the 2025 Math and AI 4 Girls Competition for a chance to win up to $1,000!
Hey Everyone, I'm pleased to announce the dates for the 2025 MA4G Competition are set!
Applications will open on March 22nd, 2025, and they will close on April 26th, 2025 (@ 11:59pm PST).
Applicants will have one month to fill out an application with prizes for the top 50 contestants & cash prizes for the top 20 contestants (including $1,000 for the winner!). More details below!
Eligibility:
The competition is free to enter, and open to middle school female students living in the US (5th-8th grade).
Award recipients are selected based on their aptitude, activities and aspirations in STEM.
Event dates:
Applications will open on March 22nd, 2025, and they will close on April 26th, 2025 (by 11:59pm PST)
Winners will be announced on June 28, 2025 during an online award ceremony.
Application requirements:
Complete a 12 question problem set on math and computer science/AI related topics
Write 2 short essays
Prizes:
1st place: $1,000 Cash prize
2nd place: $500 Cash prize
3rd place: $300 Cash prize
4th-10th: $100 Cash prize each
11th-20th: $50 Cash prize each
Top 50 contestants: Over $50 worth of gadgets and stationary
Many thanks to our current and past sponsors and partners: Hudson River Trading, MATHCOUNTS, Hewlett Packard Enterprise, Automation Anywhere, JP Morgan Chase, D.E. Shaw, and AI4ALL.
Math and AI 4 Girls is a nonprofit organization aiming to encourage young girls to develop an interest in math and AI by taking part in STEM competitions and activities at an early age. The organization will be hosting an inaugural Math and AI 4 Girls competition to identify talent and encourage long-term planning of academic and career goals in STEM.
Let be a scalene triangle with orthocenter and circumcenter . Denote by , the midpoints of ,. Suppose the circle with diameter meets the circumcircle of at , and meets line at a point . The tangent to at meets line at . Show that the circumcircles of and intersect at a point on .
Given is an acute and scalene triangle with circumcenter . and intersect the altitude from to at points and respectively. is the circumcenter of triangle and is the reflection of over . is the second intersection of circumcircles of triangles and . Show that are collinear.
Hello, ladies and gentlemen
Let ABC be a triangle, and D, E and F the middles of the sides BC, CA and AB respectively. The perpendicular bissector of CA intersects the line AB at E' and the bissector of the A angle at K, and the perpendicular bissector of AB intersects the line AC at F' and the bissector of the A angle at J. The two circles passing through J, F and E' and through K, E and F' intersect each other at P and Q.
Show that the radical axis of these circles is the A-mediane of ABC.
Let be the circumcenter of triangle . The altitudes from of triangle intersects the circumcircle of the triangle at respectively. meets at respectively. Prove that the circumcircles of triangles share two common points.
Let be the orthocenter of an acute-angled triangle . The circle centered at the midpoint of and passing through intersects the sideline at points and . Similarly, define the points ,, and .
Let be a diameter of a circle , and let be the tangent at . Furthermore, let be a fixed, positive real, and consider all pairs of points and lying on , on opposite sides of , such that . The lines and intersect at points and , respectively. Show that all the lines pass through a common point.
Suppose that is the midpoint of the arc , containing , in the circumcircle of , and let be the -excircle's center. Assume that the external angle bisector of intersects at . Prove that is perpendicular to , where is the incenter of .
Let the circumcircle of a triangle be . The tangents to at meet at point . For a point on line which is not on the segment , let the midpoint of be . Lines meet again at points respectively. Let be the midpoint of . Prove that the points lie on a circle.
Before I say anything I want to say that the criteria for MOP invitations are not especially well-defined. Each year, the exact number and choice of students is determined based on the exact scores for that year.
That being said, as of 2016 the criteria for MOP is roughly as follows:
IMO team members and alternates ("black" group)
The next approximately 12 non-graduating USAMO students ("blue" group).
The next approximately 12 USAMO students in 9th and 10th grades ("green" or "red") The top approximately 12 students on USAJMO ("red" group)
Some varying number of non-graduating female contestants from either USAMO or USAJMO (these students represent USA at the European Girls' Math Olympiad). The exact cutoffs for each contest are determined based on the scores for that year.
Young students in 8th grades and below are invited to MOP if and only if the moon is full and the wind is blowing south-south-east. All selection is done by ID number, without student names.
The "color groups" are a convenient shorthand and not worth worrying about.
Young students in 8th grades and below are invited to MOP if and only if the moon is full and the wind is blowing south-south-east. All selection is done by ID number, without student names.
Is this true? I've never heard this rule before
Seriously though, they should make some sort of set rule for admitting people in 8th grade and below, as it seems highly subjective from year to year
Young students in 8th grades and below are invited to MOP if and only if the moon is full and the wind is blowing south-south-east. All selection is done by ID number, without student names.
Is this true? I've never heard this rule before
Seriously though, they should make some sort of set rule for admitting people in 8th grade and below, as it seems highly subjective from year to year
Does it have anything to do with MATHCOUNTS? The three middle schoolers who made it this year were 1,2,S at countdown; 1, 2, 3 written. The next few highest scoring middle school JMO participants (the two other middle school winners, and one of the two middle school HMs) did not make MATHCOUNTS nationals. Moreover, the MOP invitations were personally given by Po-Shen at nationals (if I'm not mistaken).
Y bybudu, catpiano, rafayaashary1, Adventure10, Mango247
FiveMops03 wrote:
stephcurry wrote:
v_Enhance wrote:
Young students in 8th grades and below are invited to MOP if and only if the moon is full and the wind is blowing south-south-east. All selection is done by ID number, without student names.
Is this true? I've never heard this rule before
Seriously though, they should make some sort of set rule for admitting people in 8th grade and below, as it seems highly subjective from year to year
Does it have anything to do with MATHCOUNTS? The three middle schoolers who made it this year were 1,2,S at countdown; 1, 2, 3 written. The next few highest scoring middle school JMO participants (the two other middle school winners, and one of the two middle school HMs) did not make MATHCOUNTS nationals. Moreover, the MOP invitations were personally given by Po-Shen at nationals (if I'm not mistaken).
No it doesn't have to do with MATHCOUNTS. These middle schoolers also scored higher than the other middle schoolers on the JMO/AMO which is why they were picked. Also, last year the middle school MOPper did not attend nationals which is more proof it has nothing to do with MATHCOUNTS.
Y bywu2481632, Wave-Particle, v4913, HamstPan38825, Adventure10
FiveMops03 wrote:
Does it have anything to do with MATHCOUNTS?
As I said already: all selection is done by ID number, without student names. Since we do not have Mathcounts scores attached to USA(J)MO ID numbers it is impossible for Mathcounts performance to affect the selection in any way.