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The theory of best approximation and functional analysis. (English) Zbl 0291.41020
CBMS-NSF Regional Conference Series in Applied Mathematics. 13. Philadelphia, Pa.: SIAM, Society for Industrial and Applied Mathematics. VII, 95 p. (1974).

41A50 Best approximation, Chebyshev systems
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)