Skip to main content
Log in

The best L 1-approximations of classes of functions defined by differential operators in terms of generalized splines from these classes

  • Published:
Ukrainian Mathematical Journal Aims and scope

Abstract

For classes of periodic functions defined by constraints imposed on the L 1-norm of the result of action of differential operators with constant coefficients and real spectrum on these functions, we determine the exact values of the best L 1-approximations by generalized splines from the classes considered.

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.

Institutional subscriptions

Similar content being viewed by others

References

  1. A. N. Kolmogorov, “On the best approximation of functions from a given functional class,” in: Mathematics and Mechanics. Selected Works [in Russian], Nauka, Moscow (1985), pp. 186–189.

    Google Scholar 

  2. V. N. Konovalov, “Estimates of Kolmogorov widths for classes of differentiable periodic functions,” Mat. Zametki, 35, No. 3, 369–380 (1984).

    MATH  MathSciNet  Google Scholar 

  3. V. M. Tikhomirov, Some Problems in the Theory of Approximation [in Russian], Moscow University, Moscow (1976).

    Google Scholar 

  4. V. F. Babenko, “Approximation in the mean under restrictions imposed on the derivatives of approximating functions,” in: Problems in Analysis and the Theory of Approximation [in Russian], Institute of Mathematics, Ukrainian Academy of Sciences, Kiev (1989), pp. 9–18.

    Google Scholar 

  5. V. F. Babenko, “Best L 1 -approximations of classes W r1 by splines from W r1 ,” Ukr. Mat. Zh., 46, No. 10, 1418–1421 (1994).

    Article  MathSciNet  Google Scholar 

  6. V. F. Babenko, “On the best uniform approximations by splines under restrictions imposed on their derivatives,” Mat. Zametki, 50, No. 6, 24–30 (1991).

    MathSciNet  Google Scholar 

  7. V. F. Babenko, “On the best L1-approximations by splines under restrictions imposed on their derivatives,” Mat. Zametki, 51, No. 5, 12–19 (1992).

    MathSciNet  Google Scholar 

  8. N. P. Korneichuk, Exact Constants in the Theory of Approximation [in Russian], Nauka, Moscow (1987).

    Google Scholar 

  9. V. F. Babenko, “Extremal problems in the theory of approximation and a permutation inequality,” Dokl. Akad. Nauk SSSR, 290, No. 5, 1033–1036 (1986).

    MathSciNet  Google Scholar 

  10. V. F. Babenko, “Approximation of classes of functions determined by the modulus of continuity,” Dokl. Akad. Nauk SSSR, 298, No. 6, 1296–1299 (1988).

    Google Scholar 

  11. N. P. Korneichuk, V. F. Babenko, and A. A. Ligun, Extremal Properties of Polynomials and Splines [in Russian], Naukova Dumka, Kiev (1992).

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Additional information

Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 50, No. 11, pp. 1443–1451, November, 1998.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Babenko, V.F., Azar, L. The best L 1-approximations of classes of functions defined by differential operators in terms of generalized splines from these classes. Ukr Math J 50, 1649–1658 (1998). https://doi.org/10.1007/BF02524472

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02524472

Keywords

Navigation