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For a dense set of equivalent norms, a non-reflexive Banach space contains a triangle with no Chebyshev center

Libor Veselý (2001)

Commentationes Mathematicae Universitatis Carolinae

Let X be a non-reflexive real Banach space. Then for each norm | · | from a dense set of equivalent norms on X (in the metric of uniform convergence on the unit ball of X ), there exists a three-point set that has no Chebyshev center in ( X , | · | ) . This result strengthens theorems by Davis and Johnson, van Dulst and Singer, and Konyagin.

Foreword

Frolík, Z., Souček, V., Fabián, M. (1987)

Proceedings of the 14th Winter School on Abstract Analysis

Foreword

(1979)

Abstracta. 7th Winter School on Abstract Analysis

Foreword

Bohuslav Balcar (1994)

Acta Universitatis Carolinae. Mathematica et Physica

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