Calculus of Variations and Geometric Measure Theory

M. Gobbino - N. Picenni

On the characterization of constant functions through nonlocal functionals

created by picenni on 19 Jan 2022
modified on 30 Oct 2023

[BibTeX]

Published Paper

Inserted: 19 jan 2022
Last Updated: 30 oct 2023

Journal: Commun. Contemp. Math.
Year: 2023
Doi: https://doi.org/10.1142/S0219199722500389

ArXiv: 2004.00608 PDF

Abstract:

We address a classical open question by H.Brezis and R.Ignat concerning the characterization of constant functions through double integrals that involve difference quotients. Our first result is a counterexample to the question in its full generality. This counterexample requires the construction of a function whose difference quotients avoid a sequence of intervals with endpoints that diverge to infinity. Our second result is a positive answer to the question when restricted either to functions that are bounded and approximately differentiable almost everywhere, or to functions with bounded variation. We also present some related open problems that are motivated by our positive and negative results.