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The existence of a linear polynomial operator affording the best approximation on a class of functions. (English. Russian original) Zbl 0118.28905
Sov. Math., Dokl. 3, 324-326 (1962); translation from Dokl. Akad. Nauk SSSR 143, 25-27 (1962). Errata. Ibid. 3, No. 6, vi (1963); resp. 147, 10 (1962).
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