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Found 338 Documents (Results 1–100)

Approximation of functions by some exponential-type operators. (English) Zbl 1445.41013

Ivanov, Kamen (ed.) et al., Constructive theory of functions. Proceedings of the 12th international conference, Sozopol, Bulgaria, June 11–17, 2016. Sofia: Prof. Marin Drinov Academic Publishing House. 143-158 (2018).
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The direct theorem of the theory of approximation of periodic functions with monotone Fourier coefficients in different metrics. (English. Russian original) Zbl 1419.42002

Proc. Steklov Inst. Math. 303, Suppl. 1, S100-S114 (2018); translation from Tr. Inst. Mat. Mekh. (Ekaterinburg) 23, No. 3, 144-158 (2017).
MSC:  42A10 41A17 42A32
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Inequalities between best polynomial approximations and some smoothness characteristics in the space \(L_2\) and widths of classes of functions. (English. Russian original) Zbl 1342.41033

Math. Notes 99, No. 2, 222-242 (2016); translation from Mat. Zametki 99, No. 2, 215-238 (2016).
MSC:  41A50 41A17
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Arbitrarily slow convergence of sequences of linear operators. (English) Zbl 1323.41033

Reich, Simeon (ed.) et al., Infinite products of operators and their applications. A research workshop of the Israel Science Foundation, Haifa, Israel, May 21–24, 2012. Providence, RI: American Mathematical Society (AMS) (ISBN 978-1-4704-1480-1/pbk; 978-1-4704-2275-2/ebook). Contemporary Mathematics 636. Israel Mathematical Conference Proceedings, 93-120 (2015).
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Constants in Jackson type inequalities for the best approximation of periodic functions such that some of their Fourier coefficients vanish. (English. Russian original) Zbl 1326.41022

J. Math. Sci., New York 207, No. 2, 218-225 (2015); translation from Probl. Mat. Anal. 78, 95-102 (2015).
MSC:  41A17 41A50 42A10
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On constants in the generalized Jackson theorem. (English. Russian original) Zbl 1329.41015

J. Math. Sci., New York 205, No. 2, 240-246 (2015); translation from Probl. Mat. Anal. 77, 105-110 (2014).
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On approximation by algebraic version of the trigonometric Jackson integrals \(G_{S, N}\) in weighted integral metric. (English) Zbl 1416.41035

Ivanov, Kamen (ed.) et al., Constructive theory of functions. Dedicated to Blagovest Sendov and to the memory of Vasil Popov. Proceedings of the 11th international conference, Sozopol, Bulgaria, June 9–14, 2013. Sofia: Prof. Marin Drinov Academic Publishing House. 265-273 (2014).
MSC:  41A36 41A17 41A25
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Turán type converse Markov inequalities on convex subsets of \(\mathbb{C}\). (English) Zbl 1301.41010

Kiryakova, Virginia (ed.), Complex analysis and applications ’13. Proceedings of the international conference, CAA ’13, Sofia, Bulgaria, October 31 – November 2, 2013. Dedicated to the 100th anniversary of Academician Ljubomir Iliev. Sofia: Bulgarian Academy of Sciences, Institute of Mathematics and Informatics (ISBN 978-954-8986-38-0). 252-281 (2013).
MSC:  41A17 30E10 52A10
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Strong converse results for Baskakov-Durrmeyer operators. (English) Zbl 1430.41015

Nikolov, Geno (ed.) et al., Constructive theory of functions. In memory of Borislav Bojanov. Papers from the international conference, Sozopol, Bulgaria, June 3–10, 2010. Sofia: Prof. Marin Drinov Academic Publishing House. 141-149 (2012).
MSC:  41A36 41A17 41A27
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