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Top Questions
21
votes
Some four clubs have exactly $1$ student in common
combinatorics
asked Nov 14 '14 at 0:36
math.stackexchange.com
16
votes
Ratio of product from one point and minimum distance
inequality
contest-math
combinatorial-geometry
asked Oct 24 '14 at 19:35
math.stackexchange.com
13
votes
Integer solutions of $x^3-x+9=5y^2$
elementary-number-theory
contest-math
asked Oct 18 '14 at 3:46
math.stackexchange.com
12
votes
Inequality $(1+x_1)(1+x_2)\ldots(1+x_n)\left(\frac{1}{x_1}+\frac{1}{x_2}+\cdots+\frac{1}{x_n}\right)\geq 2n^2.$
algebra-precalculus
inequality
contest-math
asked Oct 30 '14 at 15:43
math.stackexchange.com
11
votes
Time for all ants to traverse cube
combinatorics
asked Oct 16 '14 at 23:58
math.stackexchange.com
11
votes
Number of $K_{10}$ always increases
combinatorics
graph-theory
probabilistic-method
asked Oct 20 '14 at 17:49
math.stackexchange.com
11
votes
Minimum of $\sqrt{\frac{a}{b+c}}+\sqrt{\frac{b}{c+a}}+\sqrt{\frac{c}{a+b}}$
algebra-precalculus
inequality
contest-math
a.m.-g.m.-inequality
holder-inequality
asked Nov 2 '14 at 20:30
math.stackexchange.com
10
votes
Every $3\times 3$ square has even number of painted cells
combinatorics
contest-math
extremal-combinatorics
asked Oct 29 '14 at 15:43
math.stackexchange.com
8
votes
Integers neither as sum nor difference of perfect powers
elementary-number-theory
contest-math
asked Oct 31 '14 at 14:51
math.stackexchange.com
8
votes
Floor function inequality $\lfloor a\sqrt{2}\rfloor\lfloor b\sqrt{7}\rfloor <\lfloor ab\sqrt{14}\rfloor$
elementary-number-theory
contest-math
diophantine-approximation
asked Oct 22 '14 at 19:15
math.stackexchange.com
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Top Answers
10
Minimum of $\sqrt{\frac{a}{b+c}}+\sqrt{\frac{b}{c+a}}+\sqrt{\frac{c}{a+b}}$
math.stackexchange.com
5
Find all $a,b,c$ such that $\binom{a}{b} \binom{b}{c}=2\binom{a}{c}$
math.stackexchange.com
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