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Tomás
  • Member for 11 years, 10 months
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  • Brazil
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37
$\ell_p$ is Hilbert if and only if $p=2$
Oct 18, 2012
36
Why convolution regularize functions?
May 20, 2013
27
Is there no norm in $C^\infty ([a,b])$?
Sep 3, 2014
27
Different ways to prove $\sum_{k=1}^\infty \frac{1}{k^2}=\frac{\pi^2}{6}$ (the Basel problem)
Sep 27, 2012
21
What will be the support of the convolution of two test functions.
May 21, 2013
20
Suppose that there exist a set $\Gamma$ of positive measure such that $\nabla u=0, a.e.\ x\in\Gamma$.
Oct 25, 2012
17
Do diffeomorphisms act transitively on a manifold?
Oct 2, 2012
16
Why does a positive definite matrix defines a convex cone?
Oct 15, 2012
14
What are the higher derivatives of a multivariate function?
Sep 6, 2013
14
$f$ is a real function and it is $\alpha$-Holder continuous with $\alpha>1$. Is $f$ constant?
Nov 23, 2013
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I think I'm the target of a rude joke in chat
19
Are they really learning something?
12
Typing on Ipad and Ipad app.
10
Problems with homework questions
9
What is the problem with this question?
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How bad can the second derivative of a convex function be?