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Best approximation in normed linear spaces by elements of linear subspaces. (English) Zbl 0197.38601
Die Grundlehren der mathematischen Wissenschaften. 171. Bucharest: Publishing House of the Academy of the Socialist Republic of Romania; Berlin-Heidelberg-New York: Springer-Verlag 415 p. (1970).

MSC:
46B28 Spaces of operators; tensor products; approximation properties