一类正系数单叶调和函数的性质
2020-09-22李玉毛李书海张晓丽
李玉毛 李书海 张晓丽
摘 要:設f=h+g是单位圆盘U上的单叶保形复值调和函数,其中h和g在U上解析.本文中,利用从属关系定义了一类系数均为正数的调和函数类,并进一步讨论了该函数类的表示定理、偏差定理、极值点及卷积等相关性质.
关键词:调和函数;系数不等式;极值点;偏差
中图分类号:O174.3 文献标识码:A 文章编号:1673-260X(2020)06-0018-04
1 引言
假设SH表示单位圆盘U={z:|z|<1}上的单叶保形复值调和函数族的全体且具有形式f=h+g,f还满足f(0)=0,fz(0)=1,其中
参考文献:
〔1〕J. Clunie, T. Sheil-Small .Harmonic univalent functions[J]. Anna. Acade. Sci. Fenn. Ser. A .I. Math., 1984, 9: 3-25.
〔2〕Duren, Peter. Harmonic Mappings in the Plane[G].Cambridge University Press Cambridge, 2004.
〔3〕H. Silverman. Harmonic univalent function with negative coefficients[J]. J. Math. Anal. Appl ,1998, 220:283-289.
〔4〕H. Silverman, E. M. Silvia. Subclasses of harmonic univalent functions[J]. New Zeland J. Math.,1999, 28:275-284.
〔5〕Sibel Yalcin Karpuzogullaei , Metin Ozturk. A subclass of harmonif univalent functions with negative coefficients[J]. Applied Mathematics and Computation , 2003, 142: 469-476.
〔6〕C Pommerenke. Univalent Functions[M]. Vandenhoeck and Ruprecht, G¨ottingen, 1975.
〔7〕Metin Ozt¨urk, Sibel Yalcin . On Univalent Harmonic Functions[J]. Journal of Inequalities in Pure and Applied Mathematics. 2002, 3(04):1-8.