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Integral representations of harmonic functions in half spaces
Authors:Guantie Deng
Institution:School of Mathematical Sciences, Beijing Normal University, 100875 Beijing, The People's Republic of China
Abstract:In this paper, using a modified Poisson kernel in an upper half-space, we prove that a harmonic function u(z) in a upper half space with its positive part u+(x)=max{u(x),0} satisfying a slowly growing condition can be represented by its integral in the boundary of the upper half space, the integral representation is unique up to the addition of a harmonic polynomial, vanishing in the boundary of the upper half space and that its negative part u(x)=max{−u(x),0} can be dominated by a similar slowly growing condition, this improves some classical result about harmonic functions in the upper half space.
Keywords:31B10  31C05
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