Coefficient Related Problem Studies for New Subclass of Bi-Univalent Functions Defined by(s,t)-Derivative Operator and Quasi-Subordination

摘要

In this paper we introduce and investigate a new generalized class of bi-univalent functions defined by using(s,t)-derivative operator and quasi-subordination.We obtain the estimates of the first two coefficientsa2,a3and general coefficientan(n≥4)by using Faber polynomial expansion for the new class and some of its subclasses.And then we solve Fekete-Szegoprobelm for the newly defined classes.