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shinzou
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question
15
Combinatorial proof of $\sum_{k=1}^n k k!=(n+1)!-1$
Mar 20, 2015
question
12
Prove there's a simple path of length $k$ in a simple graph $G$ where all the vertices have degree of at least $k$
Jun 18, 2015
question
11
Is the sum of two distinct primes an injective function on integers?
May 3, 2018
question
7
Prove if $f$ has a right inverse function: $f\circ g=id_x$ $\iff$ $f$ is onto $Y$
May 11, 2014
question
7
Finding limits using definite integrals $\lim_{n\to\infty}\sum^n_{k=1}\frac{k^{4}}{n^{5}}$
May 13, 2015
question
6
When is it allowed to take a constant out of a series?
Apr 11, 2015
question
6
Proving $\binom {n-1}{r-1}=\sum_{k=0}^r(-1)^k\binom r k \binom{n+r-k-1}{r-k-1}$
Apr 14, 2015
question
6
How is $2^{\log_4 n}= n^{\log _42}$? [duplicate]
Jan 25, 2016
question
5
Partial fractions - different results when done in steps than not
Apr 26, 2015
question
5
In every set of $14$ integers there are two that their difference is divisible by $13$
May 25, 2015

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