A Characterization of Extremal Sets in Hilbert Spaces

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We give a characterization of extremal sets in Hilbert spaces that generalizes a classical theorem of H. W. E. Jung. We investigate also the behaviour of points near to the circumsphere of such a set with respect to the Kuratowski and Hausdorff measures of non-compactness.
10 pages, corrected some misprints

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Metric Geometry, Functional Analysis, 46B20, 46E30

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http://salesiana.dossiersoluciones.com/handle/123456789/63601

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0203190
 http://arxiv.org/abs/math/0203190

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arXiv