Nonconvex Lipschitz function in plane which is locally convex outside a discontinuum

preprint2013arXivOpen access

Abstract

We construct a Lipschitz function on $\er^{2}$ which is locally convex on the complement of some totally disconnected compact set but not convex. Existence of such function disproves a theorem that appeared in a paper by L. Pasqualini and was also cited by other authors.

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