Characterizations of proximinal, semichebychevian and chebychevian subspaces in real normed spaces (Q4009949)

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Characterizations of proximinal, semichebychevian and chebychevian subspaces in real normed spaces
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    Characterizations of proximinal, semichebychevian and chebychevian subspaces in real normed spaces (English)
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    27 September 1992
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    semi-inner products
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    characterize proximinal, semi-Chebychevian and Chebychevian subspaces
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