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On estimates of best approximations of a function of several variables by sums of two functions of a smaller number of variables. (English. Russian original) Zbl 0239.41014

Sov. Math., Dokl. 12, 1768-1772 (1971); translation from Dokl. Akad. Nauk SSSR 201, 1037-1040 (1971).
MSC:  41A63 41A50
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