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Comparison of approximation properties of generalized polynomials and splines

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Abstract

We establish that, for p ∈ [2, ∞), q = 1 or p = ∞, q ∈ [ 1, 2], the classes W rp of functions of many variables defined by restrictions on the L p-norms of mixed derivatives of order r = (r 1, r 2, ..., r m) are better approximated in the L q-metric by periodic generalized splines than by generalized trigonometric polynomials. In these cases, the best approximations of the Sobolev classes of functions of one variable by trigonometric polynomials and by periodic splines coincide.

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Authors and Affiliations

  1. Dnepropetrovsk University, Dnepropetrovsk

    V. F. Babenko, V. A. Kofanov & S. A. Pichugov

Authors
  1. V. F. Babenko
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  2. V. A. Kofanov
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  3. S. A. Pichugov
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Additional information

Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 50, No. 8, pp. 1011–1020, August, 1998.

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Babenko, V.F., Kofanov, V.A. & Pichugov, S.A. Comparison of approximation properties of generalized polynomials and splines. Ukr Math J 50, 1151–1161 (1998). https://doi.org/10.1007/BF02513080

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  • DOI: https://doi.org/10.1007/BF02513080

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