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Found 21,270 Documents (Results 1–100)

The De La Vallée Poussin sums of Fourier-Chebyshev rational integral operators and approximations to Poisson integrals on the segment. (English. Russian original) Zbl 07658747

Sib. Math. J. 64, No. 1, 137-156 (2023); translation from Sib. Mat. Zh. 64, No. 1, 162-183 (2023).
MSC:  41Axx 42Axx 30-XX
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Function spaces of logarithmic smoothness: embeddings and characterizations. (English) Zbl 07653274

Memoirs of the American Mathematical Society 1393. Providence, RI: American Mathematical Society (AMS) (ISBN 978-1-4704-5538-5/pbk; 978-1-4704-7349-5/ebook). vii, 166 p. (2023).
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Uniform with respect to the parameter \(a\in(0,1)\) two-sided estimates of the sums of sine and cosine series with coefficients \(1/k^a\) by the first terms of their asymptotics. (English. Russian original) Zbl 07661461

Proc. Steklov Inst. Math. 319, Suppl. 1, S204-S217 (2022); translation from Tr. Inst. Mat. Mekh. (Ekaterinburg) 28, No. 4, 177-190 (2022).
MSC:  42A24 11M99
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On the attribute of uniform convergence of Fourier series of the Vilenkin system in the case of unbounded \(p_k\). (English. Russian original) Zbl 07660976

Mosc. Univ. Math. Bull. 77, No. 5, 247-249 (2022); translation from Vestn. Mosk. Univ., Ser. I 77, No. 5, 48-51 (2022).
MSC:  22Axx 43-XX 22Cxx
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Piecewise general monotone functions and the Hardy-Littlewood theorem. (English. Russian original) Zbl 07655352

Proc. Steklov Inst. Math. 319, 110-123 (2022); translation from Tr. Mat. Inst. Steklova 319, 120-133 (2022).
MSC:  42A16 42B35 26A48
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A boundary value problem with conjugation conditions for a degenerate equation with the Caputo fractional derivative. (English. Russian original) Zbl 07640131

Russ. Math. 66, No. 4, 24-31 (2022); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 2022, No. 4, 27-36 (2022).
MSC:  35M10 35C10 35R11
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Conjugate rational Fourier-Chebyshev operator and its approximation properties. (English. Russian original) Zbl 07640124

Russ. Math. 66, No. 3, 35-49 (2022); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 2022, No. 3, 44-60 (2022).
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