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Found 789 Documents (Results 1–100)

The Riesz-Zygmund sums of Fourier-Chebyshev rational integral operators and their approximation properties. (English. Russian original) Zbl 07804697

Sib. Math. J. 65, No. 1, 118-138 (2024); translation from Sib. Mat. Zh. 65, No. 1, 140-163 (2024).
MSC:  41Axx 42Axx 34Exx
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On estimates of uniform approximations by rational Fourier-Chebyshev integral operators for a certain choice of poles. (English. Russian original) Zbl 1518.42004

Math. Notes 113, No. 6, 815-830 (2023); translation from Mat. Zametki 113, No. 6, 876-894 (2023).
MSC:  42A10 41A20 41A50
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Chebyshev approximation of multivariable functions by a constrained rational expression. (English. Ukrainian original) Zbl 1528.41075

Cybern. Syst. Anal. 59, No. 1, 146-155 (2023); translation from Kibern. Sist. Anal. 59, No. 1, 169-179 (2023).
MSC:  41A50 41A05 65D05
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Weighted Chebyshev polynomials on compact subsets of the complex plane. (English) Zbl 1483.30023

Gesztesy, Fritz (ed.) et al., From operator theory to orthogonal polynomials, combinatorics, and number theory. A volume in honor of Lance Littlejohn’s 70th birthday. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 285, 357-370 (2021).
MSC:  30C10 30E10 41A50
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Difference equations related to number theory. (English) Zbl 1472.39032

Baigent, Steve (ed.) et al., Progress on difference equations and discrete dynamical systems. ICDEA 25, London, UK, June 24–28, 2019. Proceedings of the 25th international conference on difference equations and applications. Cham: Springer. Springer Proc. Math. Stat. 341, 245-255 (2020).
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Chebyshev approximation by a rational expression for functions of many variables. (English. Russian original) Zbl 1458.65017

Cybern. Syst. Anal. 56, No. 5, 811-819 (2020); translation from Kibern. Sist. Anal. 2020, No. 5, 146-156 (2020).
MSC:  65D15 41A50
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A system of functions biorthogonal with the derivatives of Chebyshev second-kind polynomials of a complex variable. (English. Ukrainian original) Zbl 1450.30015

J. Math. Sci., New York 249, No. 5, 786-803 (2020); translation from Ukr. Mat. Visn. 17, No. 2, 256-277 (2020).
MSC:  30C10 30B50
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Asymptotics of Chebyshev polynomials. III: Sets saturating Szegő, Schiefermayr, and Totik-Widom bounds. (English) Zbl 1448.41026

Kurasov, Pavel (ed.) et al., Analysis as a tool in mathematical physics. In memory of Boris Pavlov. Collected papers presented at the conferences “Spectral Theory and Applications”, Stockholm, Sweden, March 13–15, 2016 and “Operator Theory, Analysis and Mathematical Physics – OTAMP2016”, Euler International Mathematical Institute, St. Petersburg, Russia, August 2–7, 2016. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 276, 231-246 (2020).
MSC:  41A50 30C10 30C80
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Extremal and approximative properties of simple partial fractions. (English. Russian original) Zbl 1459.41015

Russ. Math. 62, No. 12, 6-41 (2018); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 2018, No. 12, 9-49 (2018).
MSC:  41A50 30E10
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Chebyshev polynomials associated with a system of continua. (English) Zbl 1435.30016

Mashreghi, Javad (ed.) et al., New trends in approximation theory. In memory of André Boivin. Proceedings of the conference, Toronto, Canada, July 25–29, 2016. Toronto: The Fields Institute for Research in the Mathematical Sciences; New York, NY: Springer. Fields Inst. Commun. 81, 137-149 (2018).
MSC:  30C10
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High-order recurrence relations, Hermite-Padé approximation and Nikishin systems. (English. Russian original) Zbl 1401.30037

Sb. Math. 209, No. 3, 385-420 (2018); translation from Mat. Sb. 209, No. 3, 102-137 (2018).
MSC:  30E10 42C05 41A20
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