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On the extension of continuous linear functionals and best approximation in normed linear spaces. (English) Zbl 0141.12002

MSC:
46B99 Normed linear spaces and Banach spaces; Banach lattices
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References:
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[12] ?? Properties of the surface of the unit cell and applications to the solution of the problem of uniqueness of the polynomial of best approximation in arbitrary Banach spaces (rumanian). Studii ?i cercet. mat.7 95-145 (1956).
[13] ?? Caractérisation des éléments de meilleure approximation dans un espace de Banach quelconque. Acta Sci. Math.17, 181-189 (1956). · Zbl 0072.13003
[14] ?? On the uniqueness of the element of best approximation in arbitrary Banach spaces (rumanian). Studii ?i cercet mat.8, 235-244 (1957).
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[16] ?? Choquet spaces and best approximation. Math. Ann.148, 330-340 (1962). · Zbl 0105.09104
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