Real Analysis Exchange
Real Anal. Exchange
Volume 30, Number 2 (2004), 747 - 754 .
An Lp differentiable non-differentiable function.
J. Marshall Ash
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There is a set $E$ of positive Lebesgue measure and a function nowhere differentiable on $E$ which is differentiable in the $L^p$ sense for every positive $p$ at each point of $E$. For every $p\in(0,\infty]$ and every positive integer $k$ there is a set $E=E(k,p)$ of positive measure and a function which for every $q< p$ has $k$ $L^q$ Peano derivatives at every point of $E$ despite not having an $L^p$ $k$th derivative at any point of $E$.
Real Anal. Exchange, Volume 30, Number 2 (2004), 747 - 754 .
https://projecteuclid.org/euclid.rae/1129416459
Primary: 26A27: Nondifferentiability (nondifferentiable functions, points of nondifferentiability), discontinuous derivatives
Secondary: 26A24: Differentiation (functions of one variable): general theory, generalized derivatives, mean-value theorems [See also 28A15]
$L^{p}$ derivative Peano derivative $L^{p}$ Peano derivative super density
Ash, J. Marshall. An L p differentiable non-differentiable function. Real Anal. Exchange 30 (2004), no. 2, 747 -- 754. https://projecteuclid.org/euclid.rae/1129416459
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