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On Lebesgue points of entropy solutions to the eikonal equation

Part of: General first-order equations and systems Partial differential equations

Published online by Cambridge University Press:  23 May 2023

Xavier Lamy Open the ORCID record for Xavier Lamy [Opens in a new window]  and
Elio Marconi Open the ORCID record for Elio Marconi [Opens in a new window]
Xavier Lamy
Affiliation:
Institut de Mathématiques de Toulouse, UMR 5219, Université de Toulouse, CNRS, UPS IMT, F-31062 Toulouse Cedex 9, France (xlamy@math.univ-toulouse.fr)
Elio Marconi
Affiliation:
Dipartimento di Matematica ‘Tullio Levi Civita’, Università di Padova, via Trieste 63, 35121 Padova, PD, Italy (elio.marconi@unipd.it)
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Abstract

We consider entropy solutions to the eikonal equation $|\nabla u|=1$ in two-space dimensions. These solutions are motivated by a class of variational problems and fail in general to have bounded variation. Nevertheless, they share several of their fine properties with BV functions: we show in particular that the set of non-Lebesgue points has at least one co-dimension.

Keywords

Aviles–Gigaeikonal equationLagrangian representation

MSC classification

Primary: 35F20: Nonlinear first-order equations
Secondary: 35B65: Smoothness and regularity of solutions
Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , First View , pp. 1 - 13
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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