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The Dirichlet Problem for Relative Harmonic Functions

  • Joseph L. Doob
Part of the Classics in Mathematics book series (CLASSICS)

Abstract

The class of relative harmonic functions is suggested by the following trivial remark. Let (D, OC (M, p)D) be a measurable space, and suppose that to each point ξ of D is assigned some set (perhaps empty) {μα (ξ, ·), α ∈ I ξ} of probability measures on D. Call a function generalized harmonic if it satisfies specified smoothness conditions and if
$$ v(\zeta ) = \int_D {v(\eta ({\mu_{\alpha }}(} \zeta, d\eta ) = {\mu_{\alpha }}(\zeta, v) $$
(1.1)
for ξ in D and α in I ξ. For example, if D is an open subset of ℝ N , if for each ξ the index α represents a ball B of center ξ with closure in D, if I ξ is the class of all such balls, and if μB(ξ, v) is the unweighted average of v on ∂B, then the class of continuous functions on D satisfying (1.1) is the class of harmonic functions on D. Going back to the general case, suppose that h is a strictly positive generalized harmonic function and define μh α(ξ, ·) by
$$ \mu_{\alpha }^h(\zeta, A) = \int_A {h(\eta )\frac{{{\mu_{\alpha }}(\zeta, d\eta )}}{{h(\zeta )}}} $$
(1.2)

Keywords

Harmonic Function Boundary Point Dirichlet Problem Boundary Function Harmonic Measure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Joseph L. Doob
    • 1
  1. 1.Department of MathematicsUniversity of IllinoisUrbanaUSA

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