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On the constants in inverse theorems for the first-order derivative. (English. Russian original) Zbl 07485529

Vestn. St. Petersbg. Univ., Math. 54, No. 4, 334-344 (2021); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 8(66), No. 4, 559-571 (2021).
MSC:  42A10 41A10 41A30
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Degree of convergence of some operators associated with Hardy-Littlewood series for functions of class \(Lip( \alpha , p)\), \(p > 1\). (English) Zbl 1479.42011

Rassias, Michael Th. (ed.), Harmonic analysis and applications. Cham: Springer. Springer Optim. Appl. 168, 205-241 (2021).
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Hardy-Littlewood and Ulyanov inequalities. (English) Zbl 07403469

Memoirs of the American Mathematical Society 1325. Providence, RI: American Mathematical Society (AMS) (ISBN 978-1-4704-4758-8/pbk; 978-1-4704-6628-2/ebook). viii, 118 p. (2021).
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Approximation of infinitely differentiable functions on the real line by polynomials in weighted spaces. (English. Russian original) Zbl 1476.41005

J. Math. Sci., New York 257, No. 3, 329-333 (2021); translation from Itogi Nauki Tekh., Ser. Sovrem. Mat. Prilozh., Temat. Obz. 162, 57-61 (2019).
MSC:  41A10 41A81
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