14 February 2021

• 12:3512:35, 14 February 2021 diff hist +1 2021 AMC 12A Problems/Problem 16 →Solution 3 (answer choices)
• 12:3412:34, 14 February 2021 diff hist 0 2021 AMC 12A Problems/Problem 16 →Solution 3 (answer choices)
• 12:3312:33, 14 February 2021 diff hist +688 2021 AMC 12A Problems/Problem 16 →Solution 2
• 12:2712:27, 14 February 2021 diff hist +132 2021 AMC 12A Problems/Problem 16 →Problem
• 08:4408:44, 14 February 2021 diff hist +172 2021 AMC 12B Problems/Problem 6 →Solution 2 (ratios)
• 08:4208:42, 14 February 2021 diff hist +375 2021 AMC 12B Problems/Problem 6 →Solution
• 08:3508:35, 14 February 2021 diff hist +47 2021 AMC 12B Problems/Problem 16 →See Also
• 08:3508:35, 14 February 2021 diff hist +47 2021 AMC 12B Problems/Problem 12 →See Also

11 February 2021

• 18:0418:04, 11 February 2021 diff hist +592 2021 AMC 10B Problems/Problem 1 →Solution
• 16:4216:42, 11 February 2021 diff hist −9 2021 AMC 10B Problems/Problem 5 →See Also
• 16:4116:41, 11 February 2021 diff hist +8 2021 AMC 10B Problems/Problem 5 No edit summary
• 16:4116:41, 11 February 2021 diff hist +78 2021 AMC 10B Problems/Problem 5 No edit summary
• 16:3916:39, 11 February 2021 diff hist +978 2021 AMC 10B Problems/Problem 5 No edit summary
• 16:3416:34, 11 February 2021 diff hist +11 2021 AMC 10B Problems/Problem 3 →Solution 1
• 16:1916:19, 11 February 2021 diff hist +367 2021 AMC 10B Problems/Problem 4 No edit summary
• 16:1616:16, 11 February 2021 diff hist +717 2021 AMC 10B Problems/Problem 3 No edit summary
• 16:1016:10, 11 February 2021 diff hist +399 2021 AMC 10B Problems/Problem 3 No edit summary
• 16:0916:09, 11 February 2021 diff hist 0 2021 AMC 10B Problems/Problem 2 No edit summary
• 16:0816:08, 11 February 2021 diff hist +141 2021 AMC 10B Problems/Problem 2 No edit summary
• 16:0716:07, 11 February 2021 diff hist +107 2021 AMC 10B Problems/Problem 1 No edit summary
• 16:0416:04, 11 February 2021 diff hist +26 2021 AMC 10B Problems/Problem 16 No edit summary
• 16:0116:01, 11 February 2021 diff hist +365 2021 AMC 10B Problems/Problem 16 No edit summary
• 15:4915:49, 11 February 2021 diff hist +38 m 2021 AMC 10B Problems/Problem 19 Title change
• 15:4815:48, 11 February 2021 diff hist +2,056 2021 AMC 10B Problems/Problem 19 →Solution

17 January 2021

• 21:1921:19, 17 January 2021 diff hist +1,276 2020 AMC 10A Problems/Problem 20 →Solution 6 (basic vectors/coordinates)
• 20:5620:56, 17 January 2021 diff hist +395 2020 AMC 10A Problems/Problem 20 No edit summary

10 January 2021

• 10:1510:15, 10 January 2021 diff hist +2,421 1984 AIME Problems/Problem 9 →Solution 4 (coord/vector bash)
• 09:5909:59, 10 January 2021 diff hist +37 1984 AIME Problems/Problem 9 →Solution 3 (Sketchy)

27 December 2020

• 21:0021:00, 27 December 2020 diff hist +132 N 2021 AIME II Answer Key Created page with "The answer key will not be available until after the <math>2021</math> AIME II is released on Thursday, March <math>25, 2021</math>."
• 20:5920:59, 27 December 2020 diff hist +126 N 2021 AIME II Problems/Problem 7 Created page with "These problems will not be available until the <math>2021</math> AIME II is released on Thursday, March <math>25, 2021</math>."

23 August 2020

• 11:2711:27, 23 August 2020 diff hist +388 N 2004 IMO Problems/Problem 5 Created page with "In a convex quadrilateral <math>ABCD</math>, the diagonal <math>BD</math> bisects neither the angle <math>ABC</math> nor the angle <math>CDA</math>. The point <math>P</math> l..."
• 11:2611:26, 23 August 2020 diff hist +203 N 2004 IMO Problems/Problem 6 Created page with "We call a positive integer alternating if every two consecutive digits in its decimal representation are of different parity. Find all positive integers <math>n</math> which h..."
• 11:2511:25, 23 August 2020 diff hist +259 N 2004 IMO Problems/Problem 3 Created page with "Define a “hook” to be a figure made up of six unit squares as shown in this picture: http://bit.ly/IMO2004P1, or any of the figures obtained by applying rotations and refl..."
• 11:2111:21, 23 August 2020 diff hist +638 N 2005 IMO Problems/Problem 5 Created page with "Let <math>ABCD</math> be a fixed convex quadrilateral with <math>BC = DA</math> and <math>BC \nparallel DA</math>. Let two variable points <math>E</math> and <math>F</math> li..."
• 11:1911:19, 23 August 2020 diff hist +346 N 2005 IMO Problems/Problem 2 Created page with "Let <math>a_1, a_2, \dots</math> be a sequence of integers with infinitely many positive and negative terms. Suppose that for every positive integer <math>n</math> the numbers..."
• 11:1511:15, 23 August 2020 diff hist +180 N 2005 IMO Problems/Problem 3 Created page with "Let <math>x, y, z > 0</math> satisfy <math>xyz\ge 1</math>. Prove that <cmath>\frac{x^5-x^2}{x^5+y^2+z^2} + \frac{y^5-y^2}{x^2+y^5+z^2} + \frac{z^5-z^2}{x^2+y^2+z^5} \ge 0.</c..."
• 11:0511:05, 23 August 2020 diff hist +432 N 2005 IMO Problems/Problem 1 Created page with "Six points are chosen on the sides of an equilateral triangle <math>ABC</math>: <math>A_1, A_2</math> on <math>BC</math>, <math>B_1</math>, <math>B_2</math> on <math>CA</math>..."

22 August 2020

• 19:0319:03, 22 August 2020 diff hist +1 2017 AIME I Problems/Problem 9 →Solution 6 (bash, slower, but safer)
• 19:0319:03, 22 August 2020 diff hist +21 2017 AIME I Problems/Problem 9 →Solution 6 (bash, slower, but safer)
• 19:0219:02, 22 August 2020 diff hist +624 2017 AIME I Problems/Problem 9 →Solution 6 (bash, slower, but safer)

16 August 2020

• 11:2011:20, 16 August 2020 diff hist 0 m 2019 AIME II Problems/Problem 1 →Solution
• 11:2011:20, 16 August 2020 diff hist +2 2019 AIME II Problems/Problem 1 →Solution
• 11:1911:19, 16 August 2020 diff hist −1 2019 AIME II Problems/Problem 1 →Solution
• 11:1911:19, 16 August 2020 diff hist +1 2019 AIME II Problems/Problem 1 →Solution
• 11:1811:18, 16 August 2020 diff hist −1 2019 AIME II Problems/Problem 1 →Solution
• 11:1811:18, 16 August 2020 diff hist +25 2019 AIME II Problems/Problem 1 →Solution
• 11:1711:17, 16 August 2020 diff hist −10 2019 AIME II Problems/Problem 1 →Solution
• 11:1611:16, 16 August 2020 diff hist +141 2019 AIME II Problems/Problem 1 Added point E for better definition, explained the 6-8-10

9 August 2020

• 11:1411:14, 9 August 2020 diff hist +14 m 2011 AIME II Problems/Problem 4 →Solution 2

22 June 2020

• 15:3015:30, 22 June 2020 diff hist +650 N 2011 PuMAC Problems/NT Problem A8 Created page with "By multiplying both sides by 2 and simplifying, the condition becomes <math>(2a+1)^2 - 2b^2 = -1</math>. This is a variant of Pell's Equation <math>x^2 - 2y^2 = -1</math> with..." current