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.
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