Monday, February 6, 2017

real analysis - a differentiable function but its derivative is discontinuous everywhere

Is there a function $f$: $\mathbb R\to \mathbb R$ such that $f$ is differentiable everywhere but $f'$ is discontinuous everywhere?

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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...