User contributions
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- 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)
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