Journal of Inequalities and Applications 
Volume 2007 (2007), Article ID 83073, 10 pages
doi:10.1155/2007/83073
Research Article

Double Subordination-Preserving Properties for Certain Integral Operators

Nak Eun Cho1 and Shigeyoshi Owa2

 1Department of Applied Mathematics, Pukyong National University, Pusan 608-737, South Korea
2Department of Mathematics, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
Received 27 November 2006; Revised 3 January 2007; Accepted 4 January 2007

Recommended by Narendra K. Govil

Abstract

The purpose of the present paper is to obtain the sandwich-type theorem which contains the subordination- and superordination-preserving properties for certain integral operators defined on the space of normalized analytic functions in the open unit disk.