Abstract and Applied Analysis 
Volume 2008 (2008), Article ID 792160, 10 pages
doi:10.1155/2008/792160
Research Article

A Class of Nonlinear Integral Operators Preserving Double Subordinations

Oh Sang Kwon1 and Nak Eun Cho2

 1Department of Mathematics, Kyungsung University, Pusan 608-736, South Korea
2Department of Applied Mathematics, Pukyong National University, Pusan 608-737, South Korea
Received 15 February 2008; Accepted 8 May 2008

Recommended by Stevo Stevic

Abstract

The purpose of the present paper is to investigate some subordination- and superordination-preserving properties of certain integral operators defined on the space of meromorphic functions in the punctured open unit disk. The sandwich-type theorem for these integral operators is also considered.