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  • Research Article
  • Open Access

Double Subordination-Preserving Properties for Certain Integral Operators

Journal of Inequalities and Applications20072007:083073

  • Received: 27 November 2006
  • Accepted: 4 January 2007
  • Published:


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.


  • Analytic Function
  • Integral Operator
  • Unit Disk
  • Open Unit
  • Open Unit Disk


Authors’ Affiliations

Department of Applied Mathematics, Pukyong National University, Pusan, 608-737, South Korea
Department of Mathematics, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan


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© N. E. Cho and S. Owa 2007

This article is published under license to BioMed Central Ltd. 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.