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Sets of determination for harmonic functions in an NTA domain

机译:NTA域中谐波函数的确定集

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摘要

Let D be an NTA domain in R~N(N≧2) with Green function G(x, y). Without loss of generality we may assume that D contains the origin 0. It is proved that the Martin compactification of D is homeomorphic to the Euclidean closure of D and that every boundary point is minimal . Thus the ratio K(x, y) = (G(x,y))/(g(y)) with g(y) = G(y, 0) has a continuous extension on D X D. By the same symbol we denote the continuous extension. If y∈ partial deriv D, then K(·, y) is a minimal harmonic function on D. Sometimes we write K_y for K(·, y). By definition K_y(0)=1.
机译:令D为R〜N(N≥2)中具有格林函数G(x,y)的NTA域。在不失一般性的前提下,我们可以假定D包含原点0。证明了D的马丁紧缩对D的欧几里得闭包是同胚的,并且每个边界点都是最小的。因此,比率K(x,y)=(G(x,y))/(g(y))与g(y)= G(y,0)在DX D上具有连续扩展。用相同的符号表示表示连续扩展。如果y∈偏导数D,则K(·,y)是D上的最小调和函数。有时我们为K(·,y)写K_y。根据定义,K_y(0)= 1。

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