A real valued function having a continuous first derrivative for all points in domain, but higher order derivatives are not even defined
Is there an example of such a function?
2026-04-03 22:39:30.1775255970
I want to find A real valued function having a continuous first derivative for all points in domain, but with undefined higher order derivatives.
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Consider $g$ a continuous function with no derivative at any point and let $f(x)= \int_0^x g(t) dt$. Such function $g$ exists, the famous Weierstrass function is one of them.
Then $f'(x)=g(x)$ by the fondamental theorem of calculus but $f''(x)$ does not exist.