Mathematics
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Johan's user avatar
Johan
  • Member for 12 years, 9 months
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Swedish math lover

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Score Newest
question
25
If $a_n$ goes to zero, can we find signs $s_n$ such that $\sum s_n a_n$ converges?
May 23, 2012
question
22
If $\int_0^x f \ dm$ is zero everywhere then $f$ is zero almost everywhere
Jan 3, 2011
question
12
Is a smooth function convex near a local minimum?
Jan 29, 2011
answer
12
Show that there isn't $A \in M_2(\mathbb R)$ such that $A^{2004}=\begin{pmatrix} -1 &0 \\ 0&-2 \end{pmatrix}$?
Aug 19, 2011
question
11
$\sum \frac{1}{f(k)}$ converges iff $\sum \frac{f^{-1}(k)}{k^2}$ converges
Mar 3, 2011
answer
11
Fastest way to calculate $e^x$ up to arbitrary number of decimals?
Jan 21, 2011
question
10
Examples of using Green's theorem to compute one-variable integrals?
Jan 14, 2011
question
9
Does $6^x+3^x=10$ have an solution that is an algebraic number?
Oct 8, 2014
answer
8
How to prove that if $a\equiv b \pmod{kn}$ then $a^k\equiv b^k \pmod{k^2n}$
Dec 1, 2011
question
7
Must there always be a normal element with non-discrete spectrum in an infinite-dimensional C*-algebra?
Nov 17, 2011
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19
Any other sport with draws like cricket?
9
Good examples of non-convex optimization

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