### On approximation by trigonometrical polynomials in $$$L_2$$$ space

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Vakarchuk S.B. "Generalised characteristics of smoothness in inequalities of Jackson type and widths of classes of functions in $$$L_2$$$", *Matem. zametki*, 2015; 98(4): pp. 511-529. (in Russian) doi:10.1134/S0001434615090254

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DOI: https://doi.org/10.15421/241614

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