Geodesic
Approximation Properties of de la Vall\'ee-Poussin Means for Piecewise Smooth Functions
Matematičeskie zametki, Tome 100 (2016) no. 2, pp. 229-247.

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The value of the deviation of a function $f(x)$ from its de la Vallée-Poussin means $V_m^n(f,x)$ with respect to the trigonometric system for classes of piecewise smooth $2\pi$-periodic functions is estimated.
Keywords: de la Vallée-Poussin means, trigonometric system, piecewise smooth function, approximation theory, approximation properties. 
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M. G. Magomed-Kasumov. Approximation Properties of de la Vall\'ee-Poussin Means for Piecewise Smooth Functions. Matematičeskie zametki, Tome 100 (2016) no. 2, pp. 229-247. http://geodesic.mathdoc.fr/item/MZM_2016_100_2_a3/

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