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Found 20 Documents (Results 1–20)

Upper bounds for the approximation of certain classes of functions of a complex variable by Fourier series in the space \(L_2\) and \(n\)-widths. (English. Russian original) Zbl 1397.42001

Math. Notes 103, No. 4, 656-668 (2018); translation from Mat. Zametki 103, No. 4, 617-631 (2018).
MSC:  42A10 41A17 41A46
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The measure of the set of zeros of the sum of a nondegenerate sine series with monotone coefficients in the closed interval \([0,\pi]\). (English. Russian original) Zbl 1401.42002

Math. Notes 103, No. 4, 621-625 (2018); translation from Mat. Zametki 103, No. 4, 576-581 (2018).
MSC:  42A16
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