Contests & Programs AMC and other contests, summer programs, etc.
AMC and other contests, summer programs, etc.
3 M G
BBookmark  VNew Topic kLocked
Contests & Programs AMC and other contests, summer programs, etc.
AMC and other contests, summer programs, etc.
3 M G
BBookmark  VNew Topic kLocked
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Topic
First Poster
Last Poster
k a My Retirement & New Leadership at AoPS
rrusczyk   1571
N Mar 26, 2025 by SmartGroot
I write today to announce my retirement as CEO from Art of Problem Solving. When I founded AoPS 22 years ago, I never imagined that we would reach so many students and families, or that we would find so many channels through which we discover, inspire, and train the great problem solvers of the next generation. I am very proud of all we have accomplished and I’m thankful for the many supporters who provided inspiration and encouragement along the way. I'm particularly grateful to all of the wonderful members of the AoPS Community!

I’m delighted to introduce our new leaders - Ben Kornell and Andrew Sutherland. Ben has extensive experience in education and edtech prior to joining AoPS as my successor as CEO, including starting like I did as a classroom teacher. He has a deep understanding of the value of our work because he’s an AoPS parent! Meanwhile, Andrew and I have common roots as founders of education companies; he launched Quizlet at age 15! His journey from founder to MIT to technology and product leader as our Chief Product Officer traces a pathway many of our students will follow in the years to come.

Thank you again for your support for Art of Problem Solving and we look forward to working with millions more wonderful problem solvers in the years to come.

And special thanks to all of the amazing AoPS team members who have helped build AoPS. We’ve come a long way from here:IMAGE
1571 replies
rrusczyk
Mar 24, 2025
SmartGroot
Mar 26, 2025
k a March Highlights and 2025 AoPS Online Class Information
jlacosta   0
Mar 2, 2025
March is the month for State MATHCOUNTS competitions! Kudos to everyone who participated in their local chapter competitions and best of luck to all going to State! Join us on March 11th for a Math Jam devoted to our favorite Chapter competition problems! Are you interested in training for MATHCOUNTS? Be sure to check out our AMC 8/MATHCOUNTS Basics and Advanced courses.

Are you ready to level up with Olympiad training? Registration is open with early bird pricing available for our WOOT programs: MathWOOT (Levels 1 and 2), CodeWOOT, PhysicsWOOT, and ChemWOOT. What is WOOT? WOOT stands for Worldwide Online Olympiad Training and is a 7-month high school math Olympiad preparation and testing program that brings together many of the best students from around the world to learn Olympiad problem solving skills. Classes begin in September!

Do you have plans this summer? There are so many options to fit your schedule and goals whether attending a summer camp or taking online classes, it can be a great break from the routine of the school year. Check out our summer courses at AoPS Online, or if you want a math or language arts class that doesn’t have homework, but is an enriching summer experience, our AoPS Virtual Campus summer camps may be just the ticket! We are expanding our locations for our AoPS Academies across the country with 15 locations so far and new campuses opening in Saratoga CA, Johns Creek GA, and the Upper West Side NY. Check out this page for summer camp information.

Be sure to mark your calendars for the following events:
[list][*]March 5th (Wednesday), 4:30pm PT/7:30pm ET, HCSSiM Math Jam 2025. Amber Verser, Assistant Director of the Hampshire College Summer Studies in Mathematics, will host an information session about HCSSiM, a summer program for high school students.
[*]March 6th (Thursday), 4:00pm PT/7:00pm ET, Free Webinar on Math Competitions from elementary through high school. Join us for an enlightening session that demystifies the world of math competitions and helps you make informed decisions about your contest journey.
[*]March 11th (Tuesday), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS Chapter Discussion MATH JAM. AoPS instructors will discuss some of their favorite problems from the MATHCOUNTS Chapter Competition. All are welcome!
[*]March 13th (Thursday), 4:00pm PT/7:00pm ET, Free Webinar about Summer Camps at the Virtual Campus. Transform your summer into an unforgettable learning adventure! From elementary through high school, we offer dynamic summer camps featuring topics in mathematics, language arts, and competition preparation - all designed to fit your schedule and ignite your passion for learning.[/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

Prealgebra 1 Self-Paced

Prealgebra 1
Sunday, Mar 2 - Jun 22
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Prealgebra 2 Self-Paced

Prealgebra 2
Tuesday, Mar 25 - Jul 8
Sunday, Apr 13 - Aug 10
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Friday, Jul 25 - Nov 21


Introduction to Algebra A Self-Paced

Introduction to Algebra A
Sunday, Mar 23 - Jul 20
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
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Introduction to Counting & Probability Self-Paced

Introduction to Counting & Probability
Sunday, Mar 16 - Jun 8
Wednesday, Apr 16 - Jul 2
Thursday, May 15 - Jul 31
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Wednesday, Jul 9 - Sep 24
Sunday, Jul 27 - Oct 19

Introduction to Number Theory
Monday, Mar 17 - Jun 9
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Friday, May 9 - Aug 1
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Monday, Jun 9 - Aug 25
Sunday, Jun 15 - Sep 14
Tuesday, Jul 15 - Sep 30

Introduction to Algebra B Self-Paced

Introduction to Algebra B
Sunday, Mar 2 - Jun 22
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Tuesday, May 6 - Aug 19
Wednesday, Jun 4 - Sep 17
Sunday, Jun 22 - Oct 19
Friday, Jul 18 - Nov 14

Introduction to Geometry
Tuesday, Mar 4 - Aug 12
Sunday, Mar 23 - Sep 21
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
Sunday, Mar 16 - Sep 14
Tuesday, Mar 25 - Sep 2
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

Intermediate Counting & Probability
Sunday, Mar 23 - Aug 3
Wednesday, May 21 - Sep 17
Sunday, Jun 22 - Nov 2

Intermediate Number Theory
Friday, Apr 11 - Jun 27
Sunday, Jun 1 - Aug 24
Wednesday, Jun 18 - Sep 3

Precalculus
Sunday, Mar 16 - Aug 24
Wednesday, Apr 9 - Sep 3
Friday, May 16 - Oct 24
Sunday, Jun 1 - Nov 9
Monday, Jun 30 - Dec 8

Advanced: Grades 9-12

Olympiad Geometry
Wednesday, Mar 5 - May 21
Tuesday, Jun 10 - Aug 26

Calculus
Sunday, Mar 30 - Oct 5
Tuesday, May 27 - Nov 11
Wednesday, Jun 25 - Dec 17

Group Theory
Thursday, Jun 12 - Sep 11

Contest Preparation: Grades 6-12

MATHCOUNTS/AMC 8 Basics
Sunday, Mar 23 - Jun 15
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
Tuesday, Mar 4 - May 20
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Friday, May 9 - Aug 1
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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
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AMC 12 Problem Series
Tuesday, May 27 - Aug 12
Thursday, Jun 12 - Aug 28
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Wednesday, Aug 6 - Oct 22

AMC 12 Final Fives
Sunday, May 18 - Jun 15

F=ma Problem Series
Wednesday, Jun 11 - Aug 27

WOOT Programs
Visit the pages linked for full schedule details for each of these programs!


MathWOOT Level 1
MathWOOT Level 2
ChemWOOT
CodeWOOT
PhysicsWOOT

Programming

Introduction to Programming with Python
Monday, Mar 24 - Jun 16
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

Intermediate Programming with Python
Sunday, Jun 1 - Aug 24
Monday, Jun 30 - Sep 22

USACO Bronze Problem Series
Tuesday, May 13 - Jul 29
Sunday, Jun 22 - Sep 1

Physics

Introduction to Physics
Sunday, Mar 30 - Jun 22
Wednesday, May 21 - Aug 6
Sunday, Jun 15 - Sep 14
Monday, Jun 23 - Sep 15

Physics 1: Mechanics
Tuesday, Mar 25 - Sep 2
Thursday, May 22 - Oct 30
Monday, Jun 23 - Dec 15

Relativity
Sat & Sun, Apr 26 - Apr 27 (4:00 - 7:00 pm ET/1:00 - 4:00pm PT)
Mon, Tue, Wed & Thurs, Jun 23 - Jun 26 (meets every day of the week!)
0 replies
jlacosta
Mar 2, 2025
0 replies
k i Adding contests to the Contest Collections
dcouchman   1
N Apr 5, 2023 by v_Enhance
Want to help AoPS remain a valuable Olympiad resource? Help us add contests to AoPS's Contest Collections.

Find instructions and a list of contests to add here: https://artofproblemsolving.com/community/c40244h1064480_contests_to_add
1 reply
dcouchman
Sep 9, 2019
v_Enhance
Apr 5, 2023
k i Zero tolerance
ZetaX   49
N May 4, 2019 by NoDealsHere
Source: Use your common sense! (enough is enough)
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]$lim_{n\to 1}^{+\infty}\frac{1}{n}-lnn$[/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 $x^{3}+y^{3}=z^{3}$, do not answer with "$x=y=z=0$ is a solution" only. Either you post any kind of proof or at least something unexpected (like "$x=1337, y=481, z=42$ is the smallest solution). Someone that does not see that $x=y=z=0$ 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.
49 replies
ZetaX
Feb 27, 2007
NoDealsHere
May 4, 2019
disjoint subsets
nayel   2
N an hour ago by alexanderhamilton124
Source: Taiwan 2001
Let $n\ge 3$ be an integer and let $A_{1}, A_{2},\dots, A_{n}$ be $n$ distinct subsets of $S=\{1, 2,\dots, n\}$. Show that there exists $x\in S$ such that the n subsets $A_{i}-\{x\}, i=1,2,\dots n$ are also disjoint.

what i have is this
2 replies
nayel
Apr 18, 2007
alexanderhamilton124
an hour ago
USAMO Scores Release Date
CrunchyCucumber   0
an hour ago
Does anyone know when individual scores, and medal+MOP cutoffs on the USAMO will be officially released? The website says 2-3 weeks, but I’ve heard it takes much longer in previous year.
0 replies
CrunchyCucumber
an hour ago
0 replies
Modular Arithmetic and Integers
steven_zhang123   2
N an hour ago by GreekIdiot
Integers \( n, a, b \in \mathbb{Z}^+ \) satisfies \( n + a + b = 30 \). If \( \alpha < b, \alpha \in \mathbb{Z^+} \), find the maximum possible value of $\sum_{k=1}^{\alpha} \left \lfloor \frac{kn^2 \bmod a }{b-k}  \right \rfloor $.
2 replies
steven_zhang123
Mar 28, 2025
GreekIdiot
an hour ago
f(x+y)f(z)=f(xz)+f(yz)
dangerousliri   30
N an hour ago by GreekIdiot
Source: Own
Find all functions $f:\mathbb{R}\rightarrow\mathbb{R}$ such that for all irrational numbers $x, y$ and $z$,
$$f(x+y)f(z)=f(xz)+f(yz)$$
Some stories about this problem. This problem it is proposed by me (Dorlir Ahmeti) and Valmir Krasniqi. We did proposed this problem for IMO twice, on 2018 and on 2019 from Kosovo. None of these years it wasn't accepted and I was very surprised that it wasn't selected at least for shortlist since I think it has a very good potential. Anyway I hope you will like the problem and you are welcomed to give your thoughts about the problem if it did worth to put on shortlist or not.
30 replies
dangerousliri
Jun 25, 2020
GreekIdiot
an hour ago
Unsolved NT, 3rd time posting
GreekIdiot   6
N an hour ago by GreekIdiot
Source: own
Solve $5^x-2^y=z^3$ where $x,y,z \in \mathbb Z$
Hint
6 replies
GreekIdiot
Mar 26, 2025
GreekIdiot
an hour ago
Need hint:''(
Buh_-1235   0
an hour ago
Source: Canada Winter mock 2015
Recall that for any positive integer m, φ(m) denotes the number of positive integers less than m which are relatively
prime to m. Let n be an odd positive integer such that both φ(n) and φ(n + 1) are powers of two. Prove n + 1 is power
of two or n = 5.
0 replies
Buh_-1235
an hour ago
0 replies
Berkeley mini Math Tournament Solutions Released
BerkeleyMathTournament   5
N an hour ago by fake123
BmMT Solutions Leaked :oops_sign: https://berkeley.mt/relaysolutions
5 replies
1 viewing
BerkeleyMathTournament
3 hours ago
fake123
an hour ago
CMIMC 2025
Allen31415   4
N an hour ago by vincentwant
Hi everyone,

CMIMC's annual math competition will take place on March 15, 2025. Registration is now open, and there is no registration fee, so make sure to sign up! Please see the flyer below for details. Email us at cmimc.info@gmail.com, or put any questions in this thread.
4 replies
Allen31415
Nov 21, 2024
vincentwant
an hour ago
Gut inequality
giangtruong13   1
N 2 hours ago by arqady
Let $a,b,c>0$ satisfy that $a+b+c=3$. Find the minimum $$\sum_{cyc} \sqrt[4]{\frac{a^3}{b+c}}$$
1 reply
giangtruong13
4 hours ago
arqady
2 hours ago
Minimize Expression Over Permutation
amuthup   37
N 2 hours ago by mananaban
Source: 2021 ISL A3
For each integer $n\ge 1,$ compute the smallest possible value of \[\sum_{k=1}^{n}\left\lfloor\frac{a_k}{k}\right\rfloor\]over all permutations $(a_1,\dots,a_n)$ of $\{1,\dots,n\}.$

Proposed by Shahjalal Shohag, Bangladesh
37 replies
amuthup
Jul 12, 2022
mananaban
2 hours ago
Let's Invert Some
Shweta_16   8
N 2 hours ago by ihategeo_1969
Source: STEMS 2020 Math Category B/P4 Subjective
In triangle $\triangle{ABC}$ with incenter $I$, the incircle $\omega$ touches sides $AC$ and $AB$ at points $E$ and $F$, respectively. A circle passing through $B$ and $C$ touches $\omega$ at point $K$. The circumcircle of $\triangle{KEC}$ meets $BC$ at $Q \neq C$. Prove that $FQ$ is parallel to $BI$.

Proposed by Anant Mudgal
8 replies
Shweta_16
Jan 26, 2020
ihategeo_1969
2 hours ago
very cute geo
rafaello   2
N 2 hours ago by ihategeo_1969
Source: MODSMO 2021 July Contest P7
Consider a triangle $ABC$ with incircle $\omega$. Let $S$ be the point on $\omega$ such that the circumcircle of $BSC$ is tangent to $\omega$ and let the $A$-excircle be tangent to $BC$ at $A_1$. Prove that the tangent from $S$ to $\omega$ and the tangent from $A_1$ to $\omega$ (distinct from $BC$) meet on the line parallel to $BC$ and passing through $A$.
2 replies
rafaello
Oct 26, 2021
ihategeo_1969
2 hours ago
Inspired by old results
sqing   3
N 2 hours ago by xytunghoanh
Source: Own
Let $ a, b,c\geq 0 $ and $ a+2b+3c= 2(\sqrt{6}-1).$ Prove that
$$a+ab+abc\leq 3$$Let $ a, b,c\geq 0 $ and $ a+2b+3c= 2\sqrt{6}-1.$ Prove that
$$a+ab+abc\leq \frac{25}{8}+\sqrt{ \frac{3}{2}}$$Let $ a, b,c\geq 0 $ and $ a+2b+3c= 2\sqrt{3}-1.$ Prove that
$$a+ab+abc\leq \frac{13}{8}+\frac{\sqrt{ 3}}{2}$$
3 replies
sqing
5 hours ago
xytunghoanh
2 hours ago
Square Root Equality
djmathman   67
N 5 hours ago by vincentwant
Source: 2013 USAJMO #6/USAMO #4
Find all real numbers $x,y,z\geq 1$ satisfying \[\min(\sqrt{x+xyz},\sqrt{y+xyz},\sqrt{z+xyz})=\sqrt{x-1}+\sqrt{y-1}+\sqrt{z-1}.\]
67 replies
djmathman
May 1, 2013
vincentwant
5 hours ago
How do I prepare for the AMCs?
AkshajK   191
N Feb 26, 2016 by bestwillcui1
Source: AoPS Threads
see here
191 replies
AkshajK
May 31, 2012
bestwillcui1
Feb 26, 2016
How do I prepare for the AMCs?
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Source: AoPS Threads
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AkshajK
4820 posts
#1 • 91 Y
Y by EuclidGenius, richardh, GoldenPi, ychen428, Binomial-theorem, edwed18, ArtofPi, bluecarneal, xtraneous, NewAlbionAcademy, yugrey, ptes77, ssilwa, r31415, dantx5, yrushi, fractals, MathLearner01, 171282, LeDonut, Einstein314, chemistrygirl, TheMaskedMagician, droid347, HYP135peppers, QuadraticFanatic2416, PiDude314, Python54, sinhaarunabh, zmyshatlp, EpicSkills32, DrMath, rjiang16, SirCalcsALot, hwl0304, ac_math, FlakeLCR, IequalSmart, mathguy623, RadioActive, C-bass, spartan168, nine_plus_ten, ShineBunny, uwotm8, rt03, 24iam24, mathboxboro, mathmaster2012, DrMathIsMagikarp1, acegikmoqsuwy2000, joshualee2000, abk2015, ZeroT, Mathaddict11, El_Ectric, MATH1945, thkim1011, ImpossibleCube, OlympusHero, Adventure10, Mango247, and 29 other users
see here
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ProblemSolver1026
1105 posts
#2 • 1 Y
Y by Adventure10
Do you take preparation information/books/other good links, etc.?
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AkshajK
4820 posts
#3 • 1 Y
Y by Adventure10
ProblemSolver1026 wrote:
Do you take preparation information/books/other good links, etc.?

Everything!
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pythag011
2453 posts
#4 • 3 Y
Y by GoldenPi, Adventure10, and 1 other user
http://www.artofproblemsolving.com/Forum/viewtopic.php?f=133&t=477037&p=2672011#p2672011 is a very nice compilation that you should probably incorporate
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ProblemSolver1026
1105 posts
#5 • 3 Y
Y by Adventure10, Mango247, and 1 other user
You could integrate post #7 on this:
http://www.artofproblemsolving.com/Forum/viewtopic.php?f=133&t=480253
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AkshajK
4820 posts
#6 • 1 Y
Y by Adventure10
for future reference, you don't have to ask, just add it to the list (quote, add it, and repost it) so i can directly copy and paste it onto the first post
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dinoboy
2903 posts
#7 • 4 Y
Y by Faustus, yugrey, Adventure10, and 1 other user
A good resources for olympiad preparation:

http://web.mit.edu/yufeiz/www/olympiad.html
This post has been edited 1 time. Last edited by dinoboy, Aug 14, 2012, 4:18 AM
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ProblemSolver1026
1105 posts
#8 • 8 Y
Y by Adventure10, Mango247, and 6 other users
Geometry Unbound: http://www-math.mit.edu/~kedlaya/geometryunbound/gu-060118.pdf
Plane Geometry: http://students.imsa.edu/~tliu/Math/planegeo.pdf
Attachments:
Lemmas in geometry.pdf (180kb)
This post has been edited 2 times. Last edited by ProblemSolver1026, Jun 13, 2013, 11:49 PM
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ProblemSolver1026
1105 posts
#9 • 17 Y
Y by ArtofPi, MathPro1000, droid347, azmath333, HYP135peppers, DivideBy0, Williamgolly, Adventure10, Mango247, and 8 other users
How do I prepare for math contests?

We all have had this question. We all have also seen this question come up in a forum topic way too many times.

Click to reveal hidden text

Add things to this list. Under problems, link to problems around the difficulty level of the contest the problems are under.

Goal: To become the largest list of AoPS preparation threads in existence

The Search feature can help come up with more Preparation links

Also, for the problems in the olympiad sections, please post links to problems from the contest page like this, so we can tell which olympiads are 'harder'

Most of the advice i posted came from here: http://www.artofproblemsolving.com/Forum/viewtopic.php?p=2237216#p2237216
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1=2
4594 posts
#10 • 12 Y
Y by GoldenPi, EuclidGenius, Mrdavid445, baijiangchen, IequalSmart, DivideBy0, Adventure10, and 5 other users
Great Big List of Everything

Cleaned up the book links, and added a bunch of not-necessarily free books.
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ProblemSolver1026
1105 posts
#11 • 5 Y
Y by Adventure10, Mango247, and 3 other users
@1=2:

Add these books for the 'not free' side:

Art and Craft of Problem Solving.
Problem Solving Strategies.
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AkshajK
4820 posts
#12 • 2 Y
Y by mathmaster2012, Adventure10
I added lots of problem sets from the Problem Sets forum.
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ProblemSolver1026
1105 posts
#13 • 1 Y
Y by Adventure10
If anyone notices, on some of the links, if you go the the general sites for all the links, you may find many more papers. Don't have time today, but I'll attach some good ones on those tomorrow.
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giratina150
1455 posts
#14 • 5 Y
Y by Adventure10 and 4 other users
Great Big List of Everything

I have added ProblemSolver1026's suggestions.
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1=2
4594 posts
#15 • 8 Y
Y by Mrdavid445, dantx5, NewAlbionAcademy, Adventure10, Mango247, and 3 other users
Great Big List of Everything

Added Wiki links to the AMC series problems in the Resources section and the AoPS Wiki. Also made pre-olympiad books compatible with the book list.
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