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On the structure of universal differentiability sets

Michael Dymond — 2017

Commentationes Mathematicae Universitatis Carolinae

A subset of $ℝ^{d}$ is called a universal differentiability set if it contains a point of differentiability of every Lipschitz function $f : ℝ^{d} \to ℝ$ . We show that any universal differentiability set contains a ‘kernel’ in which the points of differentiability of each Lipschitz function are dense. We further prove that no universal differentiability set may be decomposed as a countable union of relatively closed, non-universal differentiability sets.

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