Acta mathematica scientia,Series B

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ON A GENERALIZED MODULUS OF CONVEXITY AND UNIFORM NORMAL STRUCTURE

Yang Changsen; Wang Fenghui   

  1. College of Mathematics and Information Science, Henan Normal University,
    Xinxiang 453007, China
  • Received:2005-06-11 Revised:2005-12-25 Online:2007-10-20 Published:2007-10-20
  • Contact: Yang Changsen

Abstract:

In this article, the authors study a generalized modulus of convexity, δα(ε). Certain related geometrical properties of this modulus are analyzed. Their main result is that Banach space X has uniform normal structure if there exists ε, 0≤ε≤1, such that δα(1+ε)>(1-α)ε.

Key words: Generalized modulus of convexity, uniform normal structure,
ultraproduct

CLC Number: 

  • 46B20
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