Logarithmic convexity for supremum norms of harmonic functions
Logarithmic convexity for supremum norms of harmonic functions
复制标题
调和函数最高范数的对数凸性
DOI:
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发表时间:
1994
期刊:
影响因子:
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通讯作者:
J. Meyers
中科院分区:
文献类型:
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作者:
J. Korevaar;J. Meyers
We prove the following convexity property for supremum norms of harmonic functions. Let Q be a domain in R", Cl0 and E a subdomain and a compact subset of Q, respectively. Then there exists a constant a = <x(E, £l0, Cl) e (0,1] such that for all harmonic functions u on Cl, the inequality is valid. The case of concentric balls Cl0 a E cz Q. plays a key role in the proof. For positive harmonic functions on such balls, we determine the sharp constant a in the inequality.