期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：1983
卷号：6
DOI：10.1155/S0161171283000034
出版社：Hindawi Publishing Corporation
摘要：The convolution of two functions f(z)=∑n=0∞anzn and g(z)=∑n=0∞bnzn defined as (f∗g)(z)=∑n=0∞anbnzn. For f(z)=z−∑n=2∞anzn and g(z)=z/(1−z)2(1−γ), the extremal function for the class of functions starlike of order γ, we investigate functions h, where h(z)=(f∗g)(z), which satisfy the inequality |(zh′/h)−1|/|(zh′/h)
