Sharp Inequalities of Homogeneous Expansions of Almost Starlike Mappings of Order Alpha

Abstract

In this paper, we first obtain several sharp inequalities of homogeneous expansion for the subclass of all normalized almost starlike mappings of order \(\alpha \) defined on the unit ball B of a complex Banach space X. Then, with these sharp inequalities, we derive the sharp estimates of the third and fourth homogeneous expansions for the above mappings defined on the unit polydisk \(D^n\) in \(\mathbb {C}^n\).