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Approximation of differentiable functions by positive methods of summation of Fourier series

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Translated from Matematicheskie Zametki, Vol. 34, No. 4, pp. 515–519, October, 1983.

The author expresses gratitude to V. A. Baskakov for making several remarks about this note and pointing out [7, 9] to the author.

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Levin, V.A. Approximation of differentiable functions by positive methods of summation of Fourier series. Mathematical Notes of the Academy of Sciences of the USSR 34, 748–750 (1983). https://doi.org/10.1007/BF01157391

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