# User contributions

- 23:37, 21 April 2019
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**(+531)** . . N 2018 Putnam B Problems/Problem 1 (Created page with "==Problem== Let <math>\mathcal{P}</math> be the set of vectors defined by <cmath>\mathcal{P} = \left\{\begin{pmatrix} a \\ b \end{pmatrix} \, \middle\vert \, 0 \le a \le 2, 0...") (current) - 23:35, 21 April 2019
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**(+2,332)** . . N 2018 Putnam B Problems (Created page with "===Problem B1=== Let <math>\mathcal{P}</math> be the set of vectors defined by <cmath>\mathcal{P} = \left\{\begin{pmatrix} a \\ b \end{pmatrix} \, \middle\vert \, 0 \le a \le...") (current) - 23:11, 21 April 2019
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**(+710)** . . N 2018 Putnam (Created page with "The first link will contain the full set of test problems. The rest will contain each individual problem and its solution. 2018 Putnam A Problems *2018 Putnam A Problem...") (current) - 23:04, 21 April 2019 (diff | hist) . . (+460) . . N Putnam Problems and Solutions (Created page with "Putnam problems and solutions. *2018 Putnam *2017 Putnam *2016 Putnam *2015 Putnam *2014 Putnam *2013 Putnam *2012 Putnam *2011 Putnam *...") (current)
- 22:53, 21 April 2019 (diff | hist) . . (+363) . . N 2019 USAMO Problems/Problem 6 (Created page with "==Problem== Find all polynomials <math>P</math> with real coefficients such that <cmath>\frac{P(x)}{yz}+\frac{P(y)}{zx}+\frac{P(z)}{xy}=P(x-y)+P(y-z)+P(z-x)</cmath>holds for a...")
- 22:51, 21 April 2019
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**(+1,562)** . . N 2019 USAMO Problems/Problem 5 (Created page with "==Problem== Two rational numbers <math>\frac{m}{n}</math> and <math>\frac{n}{m} </math> are written on a blackboard, where <math>m</math> and <math>n</math> are relatively pri...") (current) - 22:49, 21 April 2019
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**(+4,021)** . . N 2019 USAMO Problems/Problem 4 (Created page with "==Problem== Let <math>n</math> be a nonnegative integer. Determine the number of ways that one can choose <math>(n+1)^2</math> sets <math>S_{i,j}\subseteq\{1,2,\ldots,2n\}</ma...") - 22:41, 21 April 2019 (diff | hist) . . (+382) . . N 2019 USAMO Problems/Problem 3 (Created page with "==Problem== Let <math>K</math> be the set of all positive integers that do not contain the digit <math>7</math> in their base-<math>10</math> representation. Find all polynomi...") (current)
- 11:44, 20 April 2019
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**(+869)** . . AoPS Wiki:Competition ratings - 00:10, 20 April 2019 (diff | hist) . . (+435) . . N 2019 USAMO Problems/Problem 2 (Created page with "==Problem== Let <math>ABCD</math> be a cyclic quadrilateral satisfying <math>AD^2 + BC^2 = AB^2</math>. The diagonals of <math>ABCD</math> intersect at <math>E</math>. Let <ma...")
- 00:06, 20 April 2019 (diff | hist) . . (-2) . . 2019 USAMO Problems/Problem 1
- 00:05, 20 April 2019 (diff | hist) . . (+457) . . 2019 USAMO
- 00:02, 20 April 2019 (diff | hist) . . (+98) . . 2019 USAMO Problems/Problem 1
- 23:57, 19 April 2019 (diff | hist) . . (+99) . . 2019 USAJMO Problems/Problem 6 (current)
- 23:51, 19 April 2019 (diff | hist) . . (0) . . m 2019 USAJMO Problems/Problem 5
- 23:50, 19 April 2019 (diff | hist) . . (+74) . . 2019 USAJMO Problems/Problem 5
- 23:48, 19 April 2019 (diff | hist) . . (-2) . . m 2019 USAJMO Problems/Problem 4
- 23:48, 19 April 2019 (diff | hist) . . (+14) . . m 2019 USAJMO Problems/Problem 4
- 23:45, 19 April 2019 (diff | hist) . . (+373) . . N 2019 USAMO Problems/Problem 1 (Created page with "==Problem 1== Let <math>\mathbb{N}</math> be the set of positive integers. A function <math>f:\mathbb{N}\to\mathbb{N}</math> satisfies the equation <cmath>\underbrace{f(f(\ldo...")
- 23:42, 19 April 2019 (diff | hist) . . (+92) . . 2019 USAMO Problems (current)
- 23:41, 19 April 2019
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**(+2,860)** . . N 2019 USAMO Problems (Created page with "==Day 1== <b>Note:</b> 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 la...") - 23:20, 19 April 2019 (diff | hist) . . (+134) . . 2019 USAJMO Problems (current)
- 23:15, 19 April 2019 (diff | hist) . . (-3) . . m 2019 USAJMO Problems/Problem 4
- 16:04, 19 April 2019 (diff | hist) . . (0) . . m 2019 USAJMO Problems
- 14:47, 19 April 2019 (diff | hist) . . (+17) . . m 2019 USAJMO Problems (→Day 2)
- 14:46, 19 April 2019
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**(+539)** . . 2019 USAJMO Problems (→Problem 6) - 14:34, 19 April 2019
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**(+506)** . . 2019 USAJMO Problems (→Problem 5) - 14:17, 19 April 2019 (diff | hist) . . (-2) . . 2019 USAJMO Problems (→Day 2)
- 14:17, 19 April 2019 (diff | hist) . . (-14) . . 2019 USAJMO Problems (→Day 2)
- 14:16, 19 April 2019
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**(+507)** . . 2019 USAJMO Problems (→Problem 4)