Monday, June 18, 2018

real analysis - Differentiable functions such that the derivative is nowhere continuous.

Is there a function $f:\mathbb R\to\mathbb R$ which is differentiable but such that the derivative is nowhere continuous?

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analysis - Injection, making bijection

I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...