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On the continuity of best approximation operators. (English) Zbl 0234.46016
Sympos. infinite dim. Topology, Baton Rouge 1967, Ann. Math. Stud. 69, 137-157 (1972).

46B10 Duality and reflexivity in normed linear and Banach spaces
46B28 Spaces of operators; tensor products; approximation properties
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
41A50 Best approximation, Chebyshev systems