Mathematics
Kelenner's user avatar
Kelenner's user avatar
Kelenner's user avatar
Kelenner
  • Member for 9 years, 5 months
  • Last seen more than 1 year ago
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All Questions Answers
Score Newest
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 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
answer
13
Prove: the sum of two nilpotent and exchangable matrices is nipotent.
Dec 10, 2014

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