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Mathematics
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Kelenner's user avatar
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Kelenner
  • Member for 10 years, 2 months
  • Last seen more than 2 years ago
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answer
41
Are the iterates of the cosine linearly independent?
Mar 21, 2018
answer
27
$A+A^2B+B=0$ implies $A^2+I$ invertible?
Jul 9, 2014
answer
22
Prove that $x\in\mathbb Q$
Aug 18, 2014
answer
19
Summation over roots of unity
Oct 31, 2017
answer
19
Bounding $\int_0^1 f(x) dx $ under the condition $\int_0^1 f'(x)^2 dx \le 1$
Jul 17, 2016
answer
17
If $f\in C[0,1)$, $\int_{0}^{1}f^{2}(t)dt =\infty$, can one construct $g\in C[0,1)$ so $\int_{0}^{1}g^{2}dt < \infty$, $\int fgdt = \infty$?
Oct 15, 2015
answer
16
Evaluating $\int_0^\infty \frac{\ln x}{x^2+2x+2}dx$
Nov 9, 2015
answer
14
Prove: the sum of two nilpotent and exchangable matrices is nipotent.
Dec 10, 2014
answer
14
Prove that a set of nine consecutive integers cannot be partitioned into two subsets with same product
Oct 14, 2015
answer
14
Sum of roots rational but product irrational
Jul 21, 2016