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question
14
Problem on bipartite graphs.
Jun 24, 2014
question
12
Prove that the sum of two elements is equal third.
Jan 14, 2014
answer
11
Does $\lim_{n\rightarrow\infty}\sin\left(\pi\sqrt[3]{n^{3}+1}\right)$ exist?
Dec 15, 2014
answer
10
$f(x)$ is non-negative and $ \int_a^bf(x)dx = 1 $, show that $ [\int_a^bf(x)\cos{kx}dx]^2 + [\int_a^bf(x)\sin{kx}dx]^2 \leq 1 $
Mar 15, 2015
question
9
Existence of some type matrix
Jun 25, 2014
question
8
Minimal "sumset basis" in the discrete linear space $F_2^n$
Nov 24, 2014
answer
8
$A$ is invertible matrix iff $Ax=0$ has the trivial solution only.
Jun 3, 2014
answer
7
Differential inequality implies inequality for points at distance pi.
May 14, 2014
answer
6
Test the convergence of a series
Aug 20, 2014
question
6
Prove that $\lim_{n\rightarrow\infty}\frac{x_1^2+x_2^2+\cdots+x_n^2}{n^2}=0$
Jul 6, 2014
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14
Minimal "sumset basis" in the discrete linear space $\mathbb F_2^n$
7
An upper bound for the difference between arithmetic and harmonic mean