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Georgey
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20
Prove that $\dfrac{(n^2)!}{(n!)^n}$ is an integer for every $n \in \mathbb{N}$
Jun 21, 2013
10
Equality holds in triangle inequality iff both numbers are positive, both are negative or one is zero
Nov 1, 2012
10
For given $n\times n$ matrix $A$ singular matrix, prove that $\operatorname{rank}(\operatorname{adj}A) \leq 1$
Jun 3, 2013
6
How do I calculate the derivative of $x|x|$?
Jan 7, 2013
6
Proving that if $A^n = 0$, then $I - A$ is invertible and $(I - A)^{-1} = I + A + \cdots + A^{n-1}$ [duplicate]
Apr 5, 2013
6
How to integrate $\int x\sin {(\sqrt{x})}\, dx$
Jun 24, 2013
5
Find the limit of the given sequence
Feb 3, 2013
5
Solve the recursion, $a_n = 3a_{n-1}-3a_{n-2}+a_{n-3}+8$
May 17, 2013
4
Prove or disprove that $a$ and $b$ are coprime integers iff $a^2$ and $b^2$ are coprime integers
Jan 23, 2013
4
How can I explain my 9 years old brother that $8a\cdot4a \neq 64a$
Jan 6, 2014
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26
What is the difference between locking with `fcntl` and `flock`?
21
Getting hex through Cin
19
Using cin.get to get an integer
17
How does System.Convert fit OO conventions?
17
How do I set a style to be 'Heading' in Word 2013?