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MAZUR INTERSECTION PROPERTIES AND DIFFERENTIABILITY OF CONVEX FUNCTIONS IN BANACH SPACES

  • P. G. GEORGIEV (a1), A. S. GRANERO (a2), M. JIMÉNEZ SEVILLA (a2) and J. P. MORENO (a3)
    • Published online: 01 April 2000
Abstract

It is proved that the dual of a Banach space with the Mazur intersection property is almost weak* Asplund. Analogously, the predual of a dual space with the weak* Mazur intersection property is almost Asplund. Through the use of these arguments, it is found that, in particular, almost all (in the Baire sense) equivalent norms on [lscr ]1(Γ) and [lscr ](Γ) are Fréchet differentiable on a dense Gδ subset. Necessary conditions for Mazur intersection properties in terms of convex sets satisfying a Krein–Milman type condition are also discussed. It is also shown that, if a Banach space has the Mazur intersection property, then every subspace of countable codimension can be equivalently renormed to satisfy this property.

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Journal of the London Mathematical Society
  • ISSN: 0024-6107
  • EISSN: 1469-7750
  • URL: /core/journals/journal-of-the-london-mathematical-society
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