30 October 2021

• 13:1113:11, 30 October 2021 diff hist +246 2020 AMC 8 Problems/Problem 22 Added note at the bottom explaining connection to collatz conjecture.

31 August 2021

• 09:2109:21, 31 August 2021 diff hist 0 m North Suburban Mathematics League Typo
• 09:2109:21, 31 August 2021 diff hist +33 North Suburban Mathematics League Updated info to match 2021-2022

25 August 2021

• 17:3217:32, 25 August 2021 diff hist +45 Elementary symmetric sum Fixed errors in a paragraph in “uses”

6 March 2021

• 00:2300:23, 6 March 2021 diff hist +1 2021 AMC 12B Problems/Problem 11 →Solution 5 (Barycentric coordinates)
• 00:2300:23, 6 March 2021 diff hist +13 2021 AMC 12B Problems/Problem 11 →Solution 5 (Barycentric coordinates)

5 March 2021

• 21:3921:39, 5 March 2021 diff hist +1,462 2021 AMC 12B Problems/Problem 11 No edit summary

26 February 2021

• 13:1613:16, 26 February 2021 diff hist +504 2000 AIME II Problems/Problem 10 Added fancier version of solution 2 that involves less bashing, also fixed some typos.

16 February 2021

• 10:0610:06, 16 February 2021 diff hist +13 2000 AMC 12 Problems/Problem 12 →Solution 2 (Nonrigorous)
• 10:0610:06, 16 February 2021 diff hist +31 m 2000 AMC 12 Problems/Problem 12 →Solution 2: Clarified that this solution isn't rigorous

11 February 2021

• 14:1814:18, 11 February 2021 diff hist −4 m 2021 AMC 12B Fixed tense since the test is no longer in the future lol

2 February 2021

• 12:0512:05, 2 February 2021 diff hist +347 2014 AMC 12B Problems/Problem 7 →Solutions
• 10:3110:31, 2 February 2021 diff hist +930 2014 AMC 10A Problems/Problem 20 added formal proof to solution 1 for those who would like a more rigorous version of it.
• 10:1210:12, 2 February 2021 diff hist +1,318 2014 AMC 12A Problems/Problem 15 Added solution

27 January 2021

• 12:1012:10, 27 January 2021 diff hist +1 2014 AMC 10A Problems/Problem 6 →Solution 6
• 12:1012:10, 27 January 2021 diff hist +438 2014 AMC 10A Problems/Problem 6 No edit summary
• 11:1611:16, 27 January 2021 diff hist +607 2013 AMC 12A Problems/Problem 21 →Solutions: added another solution

15 December 2020

• 09:5809:58, 15 December 2020 diff hist +8 2001 AMC 8 Problems/Problem 23 →Solution 3 (Multiple-choice abuse)
• 09:5809:58, 15 December 2020 diff hist +4 2001 AMC 8 Problems/Problem 23 →Solution 3 (Multiple-choice abuse)
• 09:5809:58, 15 December 2020 diff hist +316 2001 AMC 8 Problems/Problem 23 Added another solution

3 December 2020

• 15:3415:34, 3 December 2020 diff hist −1 m 2009 AMC 12A Problems/Problem 15 →Solution 3 (Fast) current
• 15:3215:32, 3 December 2020 diff hist +812 2009 AMC 12A Problems/Problem 15 Added another solution

6 November 2020

• 14:1814:18, 6 November 2020 diff hist +16 m 2020 AIME I Problems/Problem 12 Clarified the meaning of part of the solution

5 November 2020

• 10:5310:53, 5 November 2020 diff hist +38 2003 AMC 12A Problems/Problem 23 No edit summary
• 10:4910:49, 5 November 2020 diff hist +632 2003 AMC 12A Problems/Problem 22 Added solution

30 October 2020

• 12:2412:24, 30 October 2020 diff hist −1 2010 AMC 12B Problems/Problem 16 →Solution 3 (Fancier version of Solution 1)
• 12:2412:24, 30 October 2020 diff hist +24 2010 AMC 12B Problems/Problem 16 No edit summary
• 12:2312:23, 30 October 2020 diff hist +93 2010 AMC 12B Problems/Problem 16 →Solution 3 (Fancier version of Solution 1)
• 12:2212:22, 30 October 2020 diff hist +512 2010 AMC 12B Problems/Problem 16 No edit summary

19 October 2020

• 18:2618:26, 19 October 2020 diff hist +259 2000 AMC 12 Problems/Problem 21 Added another solution and removed unnecesary comments

16 October 2020

• 21:2721:27, 16 October 2020 diff hist +48 2001 IMO Shortlist Problems/N4 →Solution (Elementary Group Theory)
• 21:2321:23, 16 October 2020 diff hist +2,102 2001 IMO Shortlist Problems/N4 Added solution. My solution uses group theory, I suspect there is a very similar line of reasoning that can be written in the language of modular arithmetic, but I couldn't think of one.