Marko Riedel

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Well it's me, Marko Riedel. ;-)

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147 Answers

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13	Compute $\sum_{k=1}^{\infty}e^{-\pi k^2}\left(\pi k^2-\frac{1}{4}\right)$
10	How to prove this identity $\pi=\sum\limits_{k=-\infty}^{\infty}\left(\frac{\sin(k)}{k}\right)^{2}\;$?
9	Proof of $\frac{1}{e^{\pi}+1}+\frac{3}{e^{3\pi}+1}+\frac{5}{e^{5\pi}+1}+\ldots=\frac{1}{24}$
8	Closed form for $\sum_{n=-\infty}^{\infty}\frac{1}{(n-a)^2+b^2}$.
6	Bubble sorting question

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2,189 Reputation

+10	Permutations without any cycle of length $k$
+10	Distributing two distinct objects to identical boxes
+40	How to show that this function (related to the zeta function) is even?
+15	Finding in a string S if is possible to create a set with perfect cubes or perfect squares with elements of S.

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8 Questions

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6	asymptotics of the expected number of edges of a random acyclic digraph with indegree and outdegree at most one
6	average order of $\sum\limits_{\substack{1\le k\le n \\ (k,n)=1}} \frac{1}{k}$
6	the constant in the asymptotics of $\sum_{1\le k \le n} \frac{\varphi(k)}{k^2}$
5	asymptotics of the square indicator sum for subsequences of digits
4	unorthodox solution of a special case of the master theorem

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73 Tags

66 sequences-and-series × 15	18 graph-theory × 17
52 combinatorics × 45	17 real-analysis × 5
36 complex-analysis × 12	16 closed-form × 3
30 calculus × 9	14 integral × 9
20 summation × 9	14 trigonometry × 6

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