Are there differentiable functions F:(a,b)→R, where the set of points at which the derivative of F is discontinuous, is dense in (a,b)?
So far I've only found functions where derivatives are discontinuous only at a finite number of points.
Are there differentiable functions F:(a,b)→R, where the set of points at which the derivative of F is discontinuous, is dense in (a,b)?
So far I've only found functions where derivatives are discontinuous only at a finite number of points.
I have injection f:A→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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