Local Lipschitz bounds for solutions to certain singular elliptic equations involving one-Laplacian

TL;DR

This paper establishes local Lipschitz regularity for solutions to certain singular elliptic equations involving the one-Laplacian, overcoming degeneracy issues through approximation schemes and classical analysis techniques.

Contribution

It introduces a novel approximation approach and elementary methods to prove Lipschitz regularity for solutions to complex singular elliptic equations involving one-Laplacian.

Findings

Established local Lipschitz bounds for solutions

Used approximation schemes to handle degeneracy

Applied classical Moser's iteration and De Giorgi's truncation

Abstract

In this paper local Lipschitz regularity of weak solutions to certain singular elliptic equations involving one-Laplacian is studied. Equations treated here also contains another well-behaving elliptic operator such as $p$-Laplacian with $1<p<\infty$. The problem is that one-Laplacian is too singular on degenerate points, what is often called facet, which makes it difficult to obtain even Lipschitz regularity of weak solutions. This difficulty is overcome by making suitable approximation schemes, and by avoiding analysis on facet for approximated solutions. The key estimate is a local a priori uniform Lipschitz estimate for classical solutions to regularized equations, which is proved by Moser's iteration. Another local a priori uniform Lipschitz bounds can also be obtained by De Giorgi's truncation. Proofs of local Lipschitz estimates in this paper are rather classical and elementary in the sense that nonlinear potential estimates are not used at all.