Sunday, November 18, 2018

real analysis - Looking for differentiable function f:mathbbRtomathbbR whose derivative is nowhere continuous

Does there exist a differentiable function f:RR such that its derivative f is nowhere continuous ?

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analysis - Injection, making bijection

I have injection f:AB and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...