Roper-Suffridge算子上的偏差定理下界估计的简单证明

王建飞, 刘太顺

A Simple Proof of the Lower Bounds of Distortion Theorems on the Roper-Suffridge Operator

WANG Jian-fei, LIU Tai-shun

数学季刊 . 2009, (1): 108 -111 .