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Mathematics
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charmd
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27
Is a function periodic $f(x) = \cos (x) +\cos(x^2)$
Feb 16, 2018
25
Is a convex function always continuous?
Oct 19, 2018
17
Function $f$ such that $|f(x)-f(y)| \ge \sqrt{|x-y|}$
Feb 16, 2017
15
Power series converging at $1$ with all derivatives zero
Feb 18, 2018
13
Example of a function differentiable in a point, but not continuous in a neighborhood of the point?
Apr 21, 2016
12
Is a product of derivatives still a derivative? [duplicate]
Dec 28, 2016
11
$A^{64}=A^{27}=I$, prove $A=I$
Apr 9, 2023
10
If $f'(x)>0$ on $E$ , where $m(E)>0,$ then $m(f(E))>0$
Jan 11, 2017
10
Is this a valid argument for proving that a sum of reciprocals is irrational?
Apr 25, 2016
9
Why is a polynomial $f(x)$ sum of squares if $f(x)>0 $ for all real values of $x$?
Apr 22, 2016