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On the approximation of functions of several variables by de la Vallee Poussin rectangular sums. (English. Russian original) Zbl 0432.42018
Sov. Math., Dokl. 20, 1241-1243 (1979); translation from Dokl. Akad. Nauk SSSR 249, 265-267 (1979).
MSC:
42B99 Harmonic analysis in several variables
42A10 Trigonometric approximation
42A24 Summability and absolute summability of Fourier and trigonometric series
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