Geodesic
Best Polynomial Approximations and Widths of Classes of Functions in the Space~$L_2$
Matematičeskie zametki, Tome 103 (2018) no. 2, pp. 307-311.

Voir la notice de l'article provenant de la source Math-Net.Ru

Keywords: best polynomial approximation, Fourier series, $(\psi,\beta)$-derivative, generalized modulus of continuity, $n$-width. 
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S. B. Vakarchuk. Best Polynomial Approximations and Widths of Classes of Functions in the Space~$L_2$. Matematičeskie zametki, Tome 103 (2018) no. 2, pp. 307-311. http://geodesic.mathdoc.fr/item/MZM_2018_103_2_a12/

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