On sandwich theorems for multivalent functions involving a generalized differential operator

Abstract

a b s t r a c tThe purpose of this paper is to derive some subordination and superordination results for multivalent functions involving certain differential operator.

Sandwich Theorems for Higher-Order Derivatives of P-Valent Functions Involving a Generalized Differential Operator

“…;p (f g) ( 0, p 2 N; n 2 N 0 ) was introduced and studied by Selvaraj et al [21] (see also [7]), and D n ;1 (f g) (z) = D n (f g) (z), where the operator D n (f g) was introduced by Aouf and Mostafa [6];…”