Abstract
Sharp estimates are derived for the convergence rate of Fourier series in terms of orthogonal systems of functions for certain classes of complex variable functions, and the Kolmogorov N-widths of these classes are determined. These issues find applications in numerical analysis methods.
Similar content being viewed by others
References
V. A. Abilov, “Estimation of the Width of a Class of Functions in (p(x), L2(a, b)),” Dokl. Bolgar. Akad. Nauk 45 (10), 23–24 (1992).
F. V. Abilova, “On the Best Approximation of Functions by Algebraic Polynomials in the Mean,” Dokl. Bolgar. Akad. Nauk 46 (12), 9–11 (1993).
V. A. Abilov and F. V. Abilova, “Approximation of Functions by Algebraic Polynomials in the Mean,” Izv. Vyssh. Uchebn. Zaved., Mat. 418 (3), 61–63 (1997).
V. A. Abilov, F. V. Abilova, and M. K. Kerimov, “Sharp Estimates for the Convergence Rate of Fourier Series in Terms of Orthogonal Polynomials in L2((a, b), r(x)),” Zh. Vychisl. Mat. Mat. Fiz. 49, 966–980 (2009) [Comput. Math. Math. Phys. 49, 927-941 (2009)].
V. A. Abilov and M. K. Kerimov, “Sharp Estimates for the Convergence Rate of Double Fourier Series in Terms of Orthogonal Polynomials in the Space L2((a, b) × (s, d); r(x)q(u)),” Zh. Vychisl. Mat. Mat. Fiz. 49, 1364–1368 (2009) [Comput. Math. Math. Phys. 49, 1298-1302 (2009)].
V. I. Smirnov and N. A. Lebedev, Constructive Theory of Functions of Complex Variables (Nauka, Moscow, 1964) [in Russian].
A. N. Kolmogorov, Selected Works, Vol. 1: Mathematics and Mechanics (Nauka, Moscow, 1987) [in Russian].
N. P. Korneichuk, Sharp Constants in the Approximation Theory (Nauka, Moscow, 1987) [in Russian].
S. N. Mergelyan, “On the Completeness of Systems of Analytic Functions,” Usp. Mat. Nauk 4 (4(56)), 2–63 (1953).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © V.A. Abilov, F.V. Abilovab, M.K. Kerimov, 2010, published in Zhurnal Vychislitel’noi Matematiki i Matematicheskoi Fiziki, 2010, Vol. 50, No. 6, pp. 999–1004.
Rights and permissions
About this article
Cite this article
Abilov, V.A., Abilova, F.V. & Kerimov, M.K. Sharp estimates for the convergence rate of Fourier series of complex variable functions in L 2(D, p(z)). Comput. Math. and Math. Phys. 50, 946–950 (2010). https://doi.org/10.1134/S0965542510060023
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0965542510060023