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Found 3 Documents (Results 1–3)

Asymptotic estimates for the best uniform approximations of classes of convolution of periodic functions of high smoothness. (English. Ukrainian original) Zbl 1462.41013

J. Math. Sci., New York 252, No. 4, 526-540 (2021); translation from Ukr. Mat. Visn. 17, No. 3, 396-413 (2020).
MSC:  41A50 42A10
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Order estimates for the best approximations and approximations by Fourier sums in the classes of convolutions of periodic functions of low smoothness in the uniform metric. (English. Ukrainian original) Zbl 1350.42002

Ukr. Math. J. 66, No. 12, 1862-1882 (2015); translation from Ukr. Mat. Zh. 66, No. 12, 1658-1675 (2014).
MSC:  42A10 42A20
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Order estimates for the best approximations and approximations by Fourier sums of the classes of \((\psi, \beta)\)-differential functions. (English. Ukrainian original) Zbl 1327.42003

Ukr. Math. J. 65, No. 9, 1319-1331 (2014); translation from Ukr. Mat. Zh. 65, No. 9, 1186-1197 (2013).
MSC:  42A10 42A16
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