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平面调和映照Schwarz-Pick引理的一个表述 被引量:2

A variant of Schwarz-Pick lemma for planar harmonic mappings
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摘要 设w(z)=P[F](z)为定义在单位圆盘D上的调和映照,满足w(0)=0和w(D)D,其中F为边界函数.本文利用Poisson积分和方向导数得到w(z)的Schwarz-Pick引理的一个表述如下:A-w(z)≤maxo≤x≤1h(x,r),这里h(x,r)如(3.2)所示,为x的连续函数.进一步地,本文证明对于某些边界函数F,上述估计是精确的. Let w(z) = P[F](z) be a harmonic mapping defined in the unit disk D with the boundary function F satisfying w(0) = 0 and w(D) D. In this paper by using Poisson formula and directional derivation, we provea variant of Schwarz-Pick lemma for w(z) as follows: A-w(z)≤maxo≤x≤1h(x,r) where h(x, r) is a continuous function of x which is given by (3.2). Furthermore, for some boundary functions F we prove that the above estimate is sharp.
作者 朱剑峰
出处 《中国科学:数学》 CSCD 北大核心 2014年第8期837-842,共6页 Scientia Sinica:Mathematica
基金 国家自然科学基金(批准号:11101165) 华侨大学中青年教师科研提升资助计划(批准号:ZQN-YX110)资助项目
关键词 调和映照 Schwarz-Pick引理 POISSON公式 方向导数 harmonic mappings, Schwarz-Pick lemma, Poisson formula, directional derivative
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