Regularity of Infinity for Elliptic Equations with Measurable Coefficients and Its Consequences

Details Regularity of Infinity for Elliptic Equations with Measurable Coefficients and Its Consequences Regularity of Infinity for Elliptic Equations with Measurable Coefficients and Its Consequences

2010-10-20

arxiv.org/abs/1010.4263v1

Mathematics

Analysis of PDEs

20 pages

Scientific paper

This paper introduces a notion of regularity (or irregularity) of the point at infinity for the unbounded open subset of $\rr^{N}$ concerning second order uniformly elliptic equations with bounded and measurable coefficients, according as whether the A-harmonic measure of the point at infinity is zero (or positive). A necessary and sufficient condition for the existence of a unique bounded solution to the Dirichlet problem in an arbitrary open set of $\rr^{N}, N\ge 3$ is established in terms of the Wiener test for the regularity of the point at infinity. It coincides with the Wiener test for the regularity of the point at infinity in the case of Laplace equation. From the topological point of view, the Wiener test at infinity presents thinness criteria of sets near infinity in fine topology. Precisely, the open set is a deleted neigborhood of the point at infinity in fine topology if and only if infinity is irregular.

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