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Asymptotics of series arising from the approximation of periodic functions by Riesz and Cesàro means

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Abstract

Asymptotic expansions in powers of δ as δ → +∞ of the series

$\sum\limits_{k = 0}^\infty {( - 1)^{(\beta + 1)k} \frac{{Q((\delta ^\alpha - (ak + b)^\alpha ) + )}} {{(ak + b)^{r + 1} }}} , $

where β ∈ ℤ, α, a, b > 0, and r ∈ ℂ, while Q is an algebraic polynomial satisfying the condition Q(0) = 0, are obtained. In special cases, these series arise from the approximation of periodic differentiable functions by the Riesz and Cesàro means.

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Correspondence to V. P. Zastavnyi.

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Original Russian Text © V. P. Zastavnyi, 2013, published in Matematicheskie Zametki, 2013, Vol. 93, No. 1, pp. 45–55.

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Zastavnyi, V.P. Asymptotics of series arising from the approximation of periodic functions by Riesz and Cesàro means. Math Notes 93, 58–68 (2013). https://doi.org/10.1134/S0001434613010069

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