Abstract
We present a survey of results concerning the approximation of classes of periodic functions by the de la Vallée-Poussin sums obtained by various authors in the 20th century.
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Stepanets, A.I., Rukasov, V.I. Approximation Properties of the de la Vallée-Poussin Method. Ukrainian Mathematical Journal 54, 1324–1354 (2002). https://doi.org/10.1023/A:1023435724474
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DOI: https://doi.org/10.1023/A:1023435724474