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JOURNALS // Izvestiya of Saratov University. Mathematics. Mechanics. Informatics // Archive

Izv. Saratov Univ. Math. Mech. Inform., 2025 Volume 25, Issue 2, Pages 154–166 (Mi isu1072)

Scientific Part
Mathematics

On estimates of the best $M$-term approximations of functions of many variables in a space with a uniform metric

G. Akishev

Kazakhstan Branch of Lomonosov Moscow State University, 11 Kazhymukan St., Astana 010010, Kazakhstan

Abstract: The paper considers the space of continuous functions with a uniform metric and the anisotropic Lorentz – Zygmund space of periodic functions of many variables and the Nikol'skii – Besov class in this space. We have established estimates of the best $M$-term trigonometric approximations of functions from the Nikol'skii – Besov class in a uniform metric.

Key words: uniform metric, Lorentz – Zygmund space, Nikol'skii – Besov class, $M$-term approximation.

UDC: 517.51

Received: 24.02.2024
Revised: 16.07.2024

DOI: 10.18500/1816-9791-2025-25-2-154-166



© Steklov Math. Inst. of RAS, 2025