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

Academic Editor: Stevo Stevic

Copyright © 2008 Oh Sang Kwon and Nak Eun Cho. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.