Boundary regularity for p-harmonic functions and solutions of the obstacle problem on metric spaces

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  • Boundary regularity for <i>p</i>-harmonic functions and solutions of the obstacle problem on metric spaces

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We study p-harmonic functions in complete metric spaces equipped with a doubling Borel measure supporting a weak (1,p)-Poincaré inequality, 1<p<∞. We establish the barrier classification of regular boundary points from which it also follows that regularity is a local property of the boundary. We also prove boundary regularity at the fixed (given) boundary for solutions of the one-sided obstacle problem on bounded open sets. Regularity is further characterized in several other ways. <br>Our results apply also to Cheeger p-harmonic functions and in the Euclidean setting to $¥mathscr{A}$-harmonic functions, with the usual assumptions on $¥mathscr{A}$.

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