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Mathematics
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amsmath

Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 1 year, 5 months
  • 1,057 profile views
  • Last seen 40 mins ago

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Top Posts (156) All Questions Answers | Votes Newest

27 $ I(r) = \int_0^{2\pi}\frac{\cos(t) - r}{1 - 2r\cos t + r^2}\,dt$ is always zero for $r\in[0,1)$. Why? Jan 26
11 If $f : [a,b]\to\Bbb R$ is continuous, are there $x_1,x_2\in (a,b)$ such that $\tfrac{f(b)-f(a)}{b-a} = \tfrac{f(x_1)-f(x_2)}{x_1-x_2}$? Sep 14 '18
9 How to find the limit of series? (What should I know?) Oct 29 '17
7 Given $A\in\Bbb R^{n\times n}$, is $C_A := \{SAS^{-1} : S\in GL(n,\mathbb R)\}$ connected? Jul 20 '18
6 Inverse of an “anti-Jordan” matrix Jul 18 '18
5 Showing that given matrix does not have negative eigenvalues without using the knowledge that it is positive definite. Sep 14 '18
5 Given real angles $\phi_1,\ldots,\phi_N$, there exist infinitely many integers $n$ such that $\cos(n\phi_k) > 0$ for all $k$. Sep 8 '18
4 Let $F$ be a field with four elements $F = \{0,1,a,b\}$. What is $a^2 + a$? Oct 17 '17
4 How to see that group of unitary operators with strong operator topology is connected? Oct 14 '17
4 Bound on eigenvalues of $A+A^*$ for $A$ unitary Sep 3 '18
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