User contributions
- 14:21, 19 July 2021 (diff | hist) . . (0) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 20:58, 21 April 2018 (diff | hist) . . (+16) . . USAMO Problems and Solutions
- 11:52, 21 April 2018 (diff | hist) . . (+768) . . N 2018 USAMO Problems/Problem 5 (Created page with "==Problem 5== In convex cyclic quadrilateral <math>ABCD,</math> we know that lines <math>AC</math> and <math>BD</math> intersect at <math>E,</math> lines <math>AB</math> and <...")
- 11:52, 21 April 2018 (diff | hist) . . (+332) . . N 2018 USAMO Problems/Problem 6 (Created page with "==Problem 6== Let <math>a_n</math> be the number of permutations <math>(x_1, x_2, \dots, x_n)</math> of the numbers <math>(1,2,\dots, n)</math> such that the <math>n</math> ra...")
- 11:51, 21 April 2018 (diff | hist) . . (+411) . . N 2018 USAMO Problems/Problem 3 (Created page with "==Problem 3== For a given integer <math>n\ge 2,</math> let <math>\{a_1,a_2,…,a_m\}</math> be the set of positive integers less than <math>n</math> that are relatively prime...")
- 11:51, 21 April 2018 (diff | hist) . . (+268) . . N 2018 USAMO Problems/Problem 2 (Created page with "==Problem 2== Find all functions <math>f:(0,\infty) \rightarrow (0,\infty)</math> such that <cmath>f\left(x+\frac{1}{y}\right)+f\left(y+\frac{1}{z}\right) + f\left(z+\frac{1}...")
- 11:50, 21 April 2018 (diff | hist) . . (+273) . . N 2018 USAMO Problems/Problem 1 (Created page with "==Problem 1== Let <math>a,b,c</math> be positive real numbers such that <math>a+b+c=4\sqrt[3]{abc}</math>. Prove that <cmath>2(ab+bc+ca)+4\min(a^2,b^2,c^2)\ge a^2+b^2+c^2.</cm...")
- 11:48, 21 April 2018 (diff | hist) . . (+13) . . 2018 USAMO Problems/Problem 4 (→Solution)
- 11:48, 21 April 2018 (diff | hist) . . (+2,534) . . N 2018 USAMO Problems/Problem 4 (Created page with "==Problem 4== Let <math>p</math> be a prime, and let <math>a_1, \dots, a_p</math> be integers. Show that there exists an integer <math>k</math> such that the numbers <cmath>a_...")
- 11:45, 21 April 2018 (diff | hist) . . (-1) . . 2018 USAMO Problems (→Problem 4)
- 11:45, 21 April 2018 (diff | hist) . . (-1) . . 2018 USAMO Problems (→Problem 3)
- 11:45, 21 April 2018 (diff | hist) . . (-1) . . 2018 USAMO Problems (→Problem 2)
- 11:44, 21 April 2018 (diff | hist) . . (+34) . . 2018 USAMO Problems (→Problem 6)
- 11:44, 21 April 2018 (diff | hist) . . (+33) . . 2018 USAMO Problems (→Problem 5)
- 11:44, 21 April 2018 (diff | hist) . . (+35) . . 2018 USAMO Problems (→Problem 4)
- 11:44, 21 April 2018 (diff | hist) . . (+35) . . 2018 USAMO Problems (→Problem 3)
- 11:44, 21 April 2018 (diff | hist) . . (+35) . . 2018 USAMO Problems (→Problem 2)
- 11:43, 21 April 2018 (diff | hist) . . (+34) . . 2018 USAMO Problems (→Problem 1)
- 11:42, 21 April 2018 (diff | hist) . . (+2) . . 2018 USAMO Problems (→Problem 5)
- 11:41, 21 April 2018 (diff | hist) . . (+2) . . 2018 USAMO Problems (→Problem 6)
- 11:41, 21 April 2018 (diff | hist) . . (+1) . . 2018 USAMO Problems (→Problem 4)
- 11:41, 21 April 2018 (diff | hist) . . (+1) . . 2018 USAMO Problems (→Problem 3)
- 11:41, 21 April 2018 (diff | hist) . . (+1) . . 2018 USAMO Problems (→Problem 2)
- 11:41, 21 April 2018 (diff | hist) . . (+1) . . 2018 USAMO Problems (→Problem 1)
- 11:40, 21 April 2018 (diff | hist) . . (-285) . . 2018 USAMO Problems (→Problem 1)
- 11:40, 21 April 2018 (diff | hist) . . (-1) . . 2018 USAMO Problems (→Day 1)
- 11:40, 21 April 2018 (diff | hist) . . (+3,097) . . N 2018 USAMO Problems (Created page with "==Day 1== Note: For any geometry problem whose statement begins with an asterisk (<math>*</math>), the first page of the solution must be a large, in-scale, clearly labeled di...")
- 10:53, 21 April 2018 (diff | hist) . . (-243) . . 2018 USAJMO Problems/Problem 5 (→Solution)
- 02:58, 21 April 2018 (diff | hist) . . (+2,142) . . 2018 USAJMO Problems/Problem 5 (→Solution)
- 02:35, 21 April 2018 (diff | hist) . . (+242) . . 2018 USAJMO Problems/Problem 5 (→Solution)
- 02:03, 21 April 2018 (diff | hist) . . (+323) . . 2018 USAJMO Problems/Problem 5
- 02:01, 21 April 2018 (diff | hist) . . (+1,155) . . N 2018 USAJMO Problems/Problem 6 (Created page with "==Problem 6== Karl starts with <math>n</math> cards labeled <math>1,2,3,\dots,n</math> lined up in a random order on his desk. He calls a pair <math>(a,b)</math> of these card...")
- 01:57, 21 April 2018 (diff | hist) . . (+13) . . 2018 USAJMO Problems/Problem 4 (→Solution)
- 01:56, 21 April 2018 (diff | hist) . . (+3,912) . . N 2018 USAJMO Problems/Problem 4 (Created page with "==Problem 4== Triangle <math>ABC</math> is inscribed in a circle of radius <math>2</math> with <math>\angle ABC \geq 90^\circ</math>, and <math>x</math> is a real number satis...")
- 01:27, 21 April 2018 (diff | hist) . . (+4) . . N 2018 USAJMO Problems/Problem 5 (Created page with "TEST")
- 00:59, 15 February 2018 (diff | hist) . . (+849) . . 2018 AMC 12A Problems/Problem 23 (→Solution 3 (Nice, I Think?))
- 00:34, 15 February 2018 (diff | hist) . . (+7) . . 2018 AMC 12A Problems/Problem 23 (→Solution 3 (Nice, I Think?))
- 00:33, 15 February 2018 (diff | hist) . . (+311) . . 2018 AMC 12A Problems/Problem 23 (→Solution 3 (Nice, I Think?))
- 00:31, 15 February 2018 (diff | hist) . . (+60) . . 2018 AMC 12A Problems/Problem 23 (→Solution 3 (Nice, I Think?))
- 00:27, 15 February 2018 (diff | hist) . . (+148) . . 2018 AMC 12A Problems/Problem 23 (→Solution 3 (Nice, I Think?))
- 00:26, 15 February 2018 (diff | hist) . . (+685) . . 2018 AMC 12A Problems/Problem 23 (→Solution 3 (Nice, I Think?))
- 00:20, 15 February 2018 (diff | hist) . . (+7) . . 2018 AMC 12A Problems/Problem 23 (→Solution 3 (Nice, I Think?))
- 00:18, 15 February 2018 (diff | hist) . . (+224) . . 2018 AMC 12A Problems/Problem 23 (→Solution 3 (Nice, I Think?))
- 00:17, 15 February 2018 (diff | hist) . . (-1) . . 2018 AMC 12A Problems/Problem 23 (→Solution 2 (Overkill))
- 00:16, 15 February 2018 (diff | hist) . . (+251) . . 2018 AMC 12A Problems/Problem 23 (→Solution 3 (Nice, I Think?))
- 00:14, 15 February 2018 (diff | hist) . . (+34) . . 2018 AMC 12A Problems/Problem 23 (→Solution 2 (Overkill))
- 23:40, 5 May 2017 (diff | hist) . . (+3) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:38, 5 May 2017 (diff | hist) . . (+4) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:37, 5 May 2017 (diff | hist) . . (+149) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:36, 5 May 2017 (diff | hist) . . (+365) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:34, 5 May 2017 (diff | hist) . . (+280) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:26, 5 May 2017 (diff | hist) . . (+266) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:24, 5 May 2017 (diff | hist) . . (+225) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:14, 5 May 2017 (diff | hist) . . (0) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:14, 5 May 2017 (diff | hist) . . (+331) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:10, 5 May 2017 (diff | hist) . . (-21) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:09, 5 May 2017 (diff | hist) . . (+467) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:06, 5 May 2017 (diff | hist) . . (+238) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 23:02, 5 May 2017 (diff | hist) . . (+286) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 22:59, 5 May 2017 (diff | hist) . . (+88) . . 2017 USAJMO Problems/Problem 3 (→Solution 2)
- 22:58, 5 May 2017 (diff | hist) . . (+18) . . 2017 USAJMO Problems/Problem 3 (→Solution)
- 17:49, 5 May 2017 (diff | hist) . . (-146) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 17:27, 3 May 2017 (diff | hist) . . (+6) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 17:26, 3 May 2017 (diff | hist) . . (+381) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 17:22, 3 May 2017 (diff | hist) . . (+4) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 17:22, 3 May 2017 (diff | hist) . . (+4) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 17:19, 3 May 2017 (diff | hist) . . (-4) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 17:18, 3 May 2017 (diff | hist) . . (-5) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 17:18, 3 May 2017 (diff | hist) . . (+158) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 17:16, 3 May 2017 (diff | hist) . . (+1,486) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 17:03, 3 May 2017 (diff | hist) . . (+10) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 16:41, 3 May 2017 (diff | hist) . . (+500) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 03:25, 3 May 2017 (diff | hist) . . (-88) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 03:07, 3 May 2017 (diff | hist) . . (-24) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 03:07, 3 May 2017 (diff | hist) . . (+473) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 03:03, 3 May 2017 (diff | hist) . . (+838) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 02:56, 3 May 2017 (diff | hist) . . (+257) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 02:53, 3 May 2017 (diff | hist) . . (+618) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 02:39, 3 May 2017 (diff | hist) . . (+39) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 02:38, 3 May 2017 (diff | hist) . . (+455) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 02:35, 3 May 2017 (diff | hist) . . (-1) . . 2017 USAMO Problems/Problem 5 (→Solution (INCOMPLETE))
- 02:34, 3 May 2017 (diff | hist) . . (+436) . . 2017 USAMO Problems/Problem 5 (→Solution 1)
- 02:31, 3 May 2017 (diff | hist) . . (+396) . . 2017 USAMO Problems/Problem 5 (→Problem)
- 02:31, 3 May 2017 (diff | hist) . . (+29) . . N 2017 USAMO Problems/Problem 5 (Created page with "== Problem == ==Solution 1==")
- 02:47, 6 July 2016 (diff | hist) . . (+4) . . 1994 AIME Problems/Problem 3 (→Solution 2)
- 02:47, 6 July 2016 (diff | hist) . . (+549) . . 1994 AIME Problems/Problem 3 (→Solution 2)
- 02:43, 6 July 2016 (diff | hist) . . (+1) . . 1994 AIME Problems/Problem 3 (→Solution 2)
- 02:42, 6 July 2016 (diff | hist) . . (+395) . . 1994 AIME Problems/Problem 3 (→Solution)
- 03:30, 30 April 2016 (diff | hist) . . (-115) . . 2016 USAMO Problems/Problem 2 (→Solution 2 (Controversial))
- 03:29, 30 April 2016 (diff | hist) . . (+1,373) . . 2016 USAMO Problems/Problem 2 (→Solution)
- 15:28, 29 April 2016 (diff | hist) . . (0) . . 2015 AIME I Problems/Problem 4 (→Solution 3)
- 23:50, 27 April 2016 (diff | hist) . . (+147) . . 2016 USAMO Problems/Problem 1 (→Solution 2)
- 23:49, 27 April 2016 (diff | hist) . . (+278) . . 2016 USAMO Problems/Problem 1 (→Solution 2)
- 23:04, 27 April 2016 (diff | hist) . . (0) . . 2016 USAMO Problems/Problem 1 (→Solution 2)
- 23:02, 27 April 2016 (diff | hist) . . (+2,464) . . 2016 USAMO Problems/Problem 1 (→Solution 2)
- 22:29, 27 April 2016 (diff | hist) . . (+234) . . 2016 USAMO Problems/Problem 1 (→Solution 2)
- 22:18, 27 April 2016 (diff | hist) . . (+1,203) . . 2016 USAMO Problems/Problem 1 (→Solution)
- 20:50, 27 April 2016 (diff | hist) . . (+131) . . 2016 USAMO Problems/Problem 6 (→Solution)
- 20:48, 27 April 2016 (diff | hist) . . (-2) . . 2016 USAMO Problems/Problem 6 (→Solution)
- 20:48, 27 April 2016 (diff | hist) . . (+3,185) . . 2016 USAMO Problems/Problem 6 (→Solution)
- 20:11, 27 April 2016 (diff | hist) . . (+1,808) . . 2016 USAMO Problems/Problem 6
- 19:51, 27 April 2016 (diff | hist) . . (+37) . . 2016 USAMO Problems (→Problem 5)
- 19:50, 27 April 2016 (diff | hist) . . (+43) . . 2016 USAMO Problems (→Problem 3)
- 04:16, 27 April 2016 (diff | hist) . . (+1) . . 2016 USAJMO Problems/Problem 5 (→Solution 3)
- 04:16, 27 April 2016 (diff | hist) . . (+14) . . 2016 USAJMO Problems/Problem 5 (→Solution 3)
- 04:14, 27 April 2016 (diff | hist) . . (+40) . . 2016 USAJMO Problems/Problem 5 (→Solution 3)
- 04:12, 27 April 2016 (diff | hist) . . (+524) . . 2016 USAJMO Problems/Problem 5 (→Solution 3)
- 04:07, 27 April 2016 (diff | hist) . . (+1) . . 2016 USAJMO Problems/Problem 5 (→Solution 3)
- 04:07, 27 April 2016 (diff | hist) . . (+2,003) . . 2016 USAJMO Problems/Problem 5 (→Solution 2)
- 01:09, 27 April 2016 (diff | hist) . . (+981) . . 2016 USAMO Problems (→Problem 6)
- 01:02, 27 April 2016 (diff | hist) . . (-11) . . 2016 USAMO Problems (→Problem 5)
- 01:01, 27 April 2016 (diff | hist) . . (-11) . . 2016 USAMO Problems (→Problem 2)
- 01:01, 27 April 2016 (diff | hist) . . (-11) . . 2016 USAMO Problems (→Problem 3)
- 01:01, 27 April 2016 (diff | hist) . . (+1) . . 2016 USAMO Problems (→Problem 4)
- 01:00, 27 April 2016 (diff | hist) . . (+568) . . 2016 USAMO Problems (→Problem 5)
- 00:57, 27 April 2016 (diff | hist) . . (+731) . . 2016 USAMO Problems (→Problem 3)
- 00:48, 27 April 2016 (diff | hist) . . (-3) . . 2016 USAMO Problems (→Problem 2)
- 00:45, 27 April 2016 (diff | hist) . . (+154) . . 2016 USAMO Problems (→Problem 2)
- 23:06, 5 April 2016 (diff | hist) . . (+361) . . 2003 USAMO Problems/Problem 4 (→Solution 2)
- 00:57, 5 April 2016 (diff | hist) . . (-6) . . 2000 USAMO Problems/Problem 1 (→Solution 2)
- 00:56, 5 April 2016 (diff | hist) . . (+1) . . 2000 USAMO Problems/Problem 1 (→Solution 2)
- 00:55, 5 April 2016 (diff | hist) . . (+1,386) . . 2000 USAMO Problems/Problem 1 (→Solution)
- 03:43, 26 November 2015 (diff | hist) . . (+8) . . 1988 AIME Problems/Problem 14 (→Solution 3)
- 03:43, 26 November 2015 (diff | hist) . . (+116) . . 1988 AIME Problems/Problem 14 (→Solution 3)
- 03:41, 26 November 2015 (diff | hist) . . (+197) . . 1988 AIME Problems/Problem 14 (→Solution 3)
- 03:37, 26 November 2015 (diff | hist) . . (+1) . . 1988 AIME Problems/Problem 14 (→Solution 3)
- 03:36, 26 November 2015 (diff | hist) . . (-1) . . 1988 AIME Problems/Problem 14 (→Solution 3)
- 03:35, 26 November 2015 (diff | hist) . . (+8) . . 1988 AIME Problems/Problem 14 (→Solution 3)
- 23:03, 25 November 2015 (diff | hist) . . (+1,201) . . 1988 AIME Problems/Problem 14 (→Solution 2)
- 20:31, 3 October 2015 (diff | hist) . . (0) . . 1987 AIME Problems/Problem 15 (→Solution)
- 20:31, 3 October 2015 (diff | hist) . . (+1) . . 1987 AIME Problems/Problem 15 (→Problem)
- 01:22, 7 July 2015 (diff | hist) . . (+2,105) . . 1960 IMO Problems/Problem 6 (→Solution)
- 00:48, 7 July 2015 (diff | hist) . . (+1,752) . . 1960 IMO Problems/Problem 6 (→Solution)
- 17:33, 23 May 2015 (diff | hist) . . (+350) . . m 2015 USAMO Problems/Problem 2 (→Solution)
- 22:48, 12 May 2015 (diff | hist) . . (+167) . . 2015 USAMO Problems (→Problem 5)
- 22:47, 12 May 2015 (diff | hist) . . (+551) . . 2015 USAMO Problems (→Problem 3)
- 22:38, 12 May 2015 (diff | hist) . . (+3) . . m 2015 USAMO Problems/Problem 1 (→Solution)
- 22:04, 25 March 2015 (diff | hist) . . (+50) . . 2015 AIME I Problems/Problem 4 (→Solution 3)
- 22:03, 25 March 2015 (diff | hist) . . (+23) . . 2015 AIME I Problems/Problem 4 (→Solution 3)
- 22:00, 25 March 2015 (diff | hist) . . (+11) . . 2015 AIME I Problems/Problem 4 (→Solution 3)
- 21:59, 25 March 2015 (diff | hist) . . (-1) . . 2015 AIME I Problems/Problem 4 (→Solution 3)
- 21:57, 25 March 2015 (diff | hist) . . (+2,180) . . 2015 AIME I Problems/Problem 4 (→Solution 3)