Mathematics
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Norbert's user avatar
Norbert
  • Member for 11 years, 4 months
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The one you probably have not heard of.

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All Questions Answers
Score Newest
answer
129
Relations between p norms
Oct 21, 2012
question
120
Continuous projections on $\ell_1$ with norm $>1$
Apr 6, 2012
answer
68
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, 2012
answer
48
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, 2013
answer
39
$\ell^p\subseteq\ell^q$ for $0<p<q<\infty$ and $\|\cdot\|_q<\|\cdot\|_p$
Feb 29, 2012
answer
36
Evaluating $ \lim\limits_{n\to\infty} \sum_{k=1}^{n^2} \frac{n}{n^2+k^2} $
Sep 4, 2012
answer
31
Surely You're Joking, Mr. Feynman! $\int_0^\infty\frac{\sin^2x}{x^2(1+x^2)}\,dx$
May 21, 2014
answer
29
Prove that $X'$ is a Banach space
Apr 14, 2012
question
29
Is it true that $\mathbb{R}$ and $\mathbb{R}^2$ are isomorphic as abelian groups?
May 14, 2012
answer
28
Gelfand Topology and C*-algebras
Feb 17, 2013
Top Meta posts
8
0
48
What was that? Chat with an "expert"
45
Suspicious behavior between two MSE users
44
Clever downvoting
12
Suggestion for new badge
6
Will split question feature be useful?
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19
Is Grothendieck classification of tensor norms and Kuratowski's 14 sets theorem somehow related?
15
Matrices with entries in a $C^*$-algebra
11
Direct proof of injectivity of $L_\infty$
10
Is $C^{\infty}(M)$ a projective Frechet $C^{\infty}(N)$-module for a smooth map $M\to N$ between compact smooth manifolds?
9
Continuous projections in $\ell_1$ with norm $>1$

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