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Limits of differentiable functions
Authors:Udayan B Darji
Institution:Department of Mathematics, University of Louisville, Louisville, Kentucky 40292
Abstract:Suppose that $\{f_n\}$ is a sequence of differentiable functions defined on 0,1] which converges uniformly to some differentiable function $f$, and $\{f'_n\}$ converges pointwise to some function $g$. Let $M = \{x: f'(x) \neq g(x)\}$. In this paper we characterize such sets $M$ under various hypotheses. It follows from one of our characterizations that $M$ can be the entire interval 0,1].

Keywords:$F_\sigma$  $G_{\delta\sigma}$  density topology  approximate continuity  nowhere measure dense
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