Mathematics
Norbert
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The one you probably have not heard of.

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119 Continuous projections on $\ell_1$ with norm $>1$ Apr 6 '12
104 Relations between p norms Oct 21 '12
60 Proving $\frac{\sin x}{x} =\left(1-\frac{x^2}{\pi^2}\right)\left(1-\frac{x^2}{2^2\pi^2}\right) \left(1-\frac{x^2}{3^2\pi^2}\right)\cdots$ Jun 12 '12
39 How to show that quotient space $X/Y$ is complete when $X$ is Banach space, and $Y$ is a closed subspace of $X$? Mar 3 '13
37 $\ell^p\subseteq\ell^q$ for $0<p<q<\infty$ and $\|\cdot\|_q<\|\cdot\|_p$ Feb 29 '12
33 Evaluating $ \lim\limits_{n\to\infty} \sum_{k=1}^{n^2} \frac{n}{n^2+k^2} $ Sep 4 '12
30 Surely You're Joking, Mr. Feynman! $\int_0^\infty\frac{\sin^2x}{x^2(1+x^2)}\,dx$ May 21 '14
28 Gelfand Topology and C*-algebras Feb 17 '13
28 Is it true that $\mathbb{R}$ and $\mathbb{R}^2$ are isomorphic as abelian groups? May 14 '12
27 Direct proof that nilpotent matrix has zero trace Dec 24 '13
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