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Uniform harmonic approximation of bounded functions
Authors:Stephen J. Gardiner
Affiliation:Department of Mathematics, University College Dublin, Dublin 4, Ireland
Abstract:Let $Omega$ be an open set in $mathbb R^n$ and $E$ be a relatively closed subset of $Omega$. We characterize those pairs $(Omega,E)$ which have the following property: every function which is bounded and continuous on $E$ and harmonic on $E^0$ can be uniformly approximated by functions harmonic on $Omega$. Several related results concerning both harmonic and superharmonic approximation are also established.

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