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Famous Question

Question with 10,000 views. This badge can be awarded multiple times.

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earned this badge 5 times.

Example of a function that is not twice differentiable

Awarded Feb 14, 2021 at 20:33

Prove the integral of $f$ is positive if $f ≥ 0$, $f$ continuous at $x_0$ and $f(x_0)>0$

Awarded Nov 22, 2019 at 0:00

Is $f'$ continuous at $0$ if $f(x)=x^2\sin(1/x)$

Awarded Oct 20, 2019 at 22:00

What does it mean for a functional equation to have a unique solution?

Awarded Oct 27, 2017 at 4:28

How to prove $\sin(1/x)$ is not uniformly continuous

Awarded Mar 17, 2016 at 17:26

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