A Subclass of Starlike Functions Defined with a Differential Operator

Abstract

This paper deals with a new subclass of starlike functions $A_{n,\lambda }^{\ast }(p,\mu ,$ $\beta ,\gamma ,\delta )$. Coefficients inequality, distortion theorems and closure theorems have been obtained for this class. Further radii of starlikeness and convexity are also obtained for this class.