摘要
本文研究了一族用微分算子定义的近于凸函数的有关极值问题。所用工具主要是函数从属原理。本文的结论推广了已有的一些结果,并改进了文献中获得的几个结论。
In this paper we study some properties of a class of close—to—convex functions defined by certain differential operator. The means we used is mainly the principle of subordination. Some known results are the consequences of ours. We also improve some conclusions obtained by R. Singh and S. Singh in paper [5].
出处
《交通科学与工程》
1993年第3期12-20,共9页
Journal of Transport Science and Engineering
关键词
单叶函数
凸函数
微分算子
univalent functions
convex functions
differential operators
