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Diameters of sets in functional spaces and the theory of best approximations. (English. Russian original) Zbl 0097.09103

Russ. Math. Surv. 15, No. 3, 75-111 (1960); translation from Usp. Mat. Nauk 15, No. 3(93), 81-120 (1960); addendum 15, No. 6(96), 226 (1960).

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