The Dirichlet Problem for p-minimizers on Finely Open Sets in Metric Spaces

Abstract

We initiate the study of fine p-(super)minimizers, associated with p-harmonic functions, on finely open sets in metric spaces, where 1 < p < infty . After having developed their basic theory, we obtain the p-fine continuity of the solution of the Dirichlet problem on a finely open set with continuous Sobolev boundary values, as a by-product of similar pointwise results. These results are new also on unweighted Rn. We build this theory in a complete metric space equipped with a doubling measure supporting a p-Poincaré inequality.