Lower bound for the best approximations of periodic summable functions of two variables and their conjugates in terms of Fourier coefficients

DOI10.1007/S11253-009-0133-0zbMath1164.42310OpenAlexW2022367195MaRDI QIDQ3607372

Publication date: 28 February 2009

Published in: Ukrainian Mathematical Journal (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1007/s11253-009-0133-0

zbMATH Keywords

best approximation Fourier coefficient periodic function

Mathematics Subject Classification ID

Trigonometric approximation (42A10) Fourier series and coefficients in several variables (42B05)

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