Skip to main content
Log in

Approximation of weakly differentiable periodic functions

  • Brief Communications
  • Published:
Ukrainian Mathematical Journal Aims and scope

Abstract

An asymptotic equality is found for the lower bounds of the best approximations of the classes C ψβ ,∞ under a condition of slow growth of ψ(·).

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Literature cited

  1. A. I. Stepanets, Classes of Periodic Functions and Approximations of Their Elements by Fourier Sums [in Russian], Preprint 83.10, Akad. Nauk UkrSSR Inst. Mat., Kiev (1983).

    Google Scholar 

  2. A. I. Stepanets, Classification and Approximation of Periodic Functions [in Russian], Naukova Dumka, Kiev (1987).

    Google Scholar 

  3. S. A. Telyakovskii, “On norms of trigonometric polynomials and approximations of differentiable functions by linear means of their Fourier series. I,” Tr. Mat. Inst. Akad. Nauk SSSR,62, 61–97 (1961).

    Google Scholar 

  4. D. N. Bushev, Approximation of Classes of Continuous Periodic Functions by Zygmund Sums [in Russian], Preprint 84.56, Akad. Nauk UkrSSR Inst. Mat., Kiev (1984).

    Google Scholar 

  5. S. A. Telyakovskii, “On the approximation of functions of given classes by Fourier sums,” Theory of Functions and Approximations [in Russian], Tr. III Sarat. Zim. Shkoly, 27 Jan.–7th Feb., 1986, Mezhvuz. Nauch. Sb., Part 1, Sarat. Univ., Saratov (1987).

    Google Scholar 

  6. S. A. Telyakovskii, “On norms of trigonometric polynomials and approximation of differentiable functions by linear means of their Fourier series. II,“ Izv. Akad. Nauk SSSR, Ser Mat.,27, No. 2, 253–272 (1963).

    Google Scholar 

  7. A. I. Stepanets, “Fourier sums: new results and unsolved problems,” Ukr. Mat. Zh.,40, No. 5, 547–576 (1988).

    Google Scholar 

  8. N. P. Korneichuk, Extremal Problems in Approximation Theory [in Russian], Nauka, Moscow (1976).

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Additional information

Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 42, No. 3, pp. 406–412, March, 1990.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Bushev, D.N., Stepanets, A.I. Approximation of weakly differentiable periodic functions. Ukr Math J 42, 361–366 (1990). https://doi.org/10.1007/BF01057026

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01057026

Keywords

Navigation