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2002-03-19
A Characterization of Extremal Sets in Hilbert Spaces
V. NguyenKhacK. NguyenVan
文献摘要
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.
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