User charmd - Mathematics Meta Stack Exchange

charmd

Member for 7 years, 7 months
Last seen more than a month ago

France

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27

Is a function periodic $f(x) = \cos (x) +\cos(x^2)$

22

Is a convex function always continuous?

17

Function $f$ such that $|f(x)-f(y)| \ge \sqrt{|x-y|}$

15

Power series converging at $1$ with all derivatives zero

13

Example of a function differentiable in a point, but not continuous in a neighborhood of the point?