Harmonic balls and two-phase Schwarz function

Details Harmonic balls and two-phase Schwarz function Harmonic balls and two-phase Schwarz function

2011-05-01

arxiv.org/abs/1105.0212v1

Mathematics

Analysis of PDEs

Scientific paper

Here we shall introduce the concept of harmonic balls/spheres in sub-domains of $\R^n$, through a mean value property for a sub-class of harmonic functions on such domains. In the complex plane, and for analytic functions, a similar concept fails to exist due to the fact that analytic functions can not have prescribed data on the boundary. Nevertheless, a two-phase version of the problem does exists, and gives rise to the generalization of the well-known Schwarz function to the case of two-phase Schwarz function. Our primary goal is to derive simple properties for these problems, and tease the appetites of experts working on Schwarz function and related topics. Hopefully these two concepts will provoke further study of the topic.

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