ON CERTAIN SUBCLASS OF p-VALENT FUNCTIONS WITH POSITIVE COEFFICIENTS

摘要

In this article, a certain differential operator S_(α,β,λ,δ,p)~kf(z) and a subclass S_(n, p) (α,β,δ,λ,p) for analytic functions with positive coefficients of the form f(z)=z~p + Σ_(n=p+1)~∞a_nz~n are introduced. Some properties such as the coefficients inequalities, distortion theorem, radii of starlikeness and convexity, closure theorems and extreme points are given. A class preserving an integral operator is also stated.