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  • Research Article
  • Open Access

An Estimate of the Essential Norm of a Composition Operator from to in the Unit Ball

Journal of Inequalities and Applications20102010:132970

  • Received: 29 June 2009
  • Accepted: 17 February 2010
  • Published:


Let be the unit ball of and a holomorphic self-map of Let , , , , and let be the composition operator between the space and -Bloch space induced by . This paper gives an estimate of the essential norm of . As a consequence, a necessary and sufficient condition for the composition operator to be compact from to is obtained.


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Authors’ Affiliations

Department of Mathematics, Tianjin University, Tianjin, 300072, China


© Zeng and Zhou. 2010

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.