if $f$ is differentiable on $(a,b)$ can we say that $f'$ is continuous on $(a,b)$?
I tried some functions and it seems that we can say so but I'm not sure.
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...
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