Abstract
An example of a continuous function is given that is differentiable except on a countable set, but is not twice Peano differentiable on any nonempty, perfect set.
Citation
A. Olevskii. C. E. Weil. "A continuous function not twice Peano differentiable on any perfect set." Real Anal. Exchange 21 (2) 789 - 792, 1995/1996.
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