On Neighbourhood and Partial Sums of a Certain Subclasses of Analytic Functions with Respect to β-Symmetric Points

Abstract

In the present investigation, we introduce a new class k-A¨C(β)(λ;γ)of analytic functions in the open unit disc U with negative coefficients. The object of the present paper is to determine coefficients estimates, neighbourhoods and partial sums for functions f(z) belonging to this class.