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This article is cited in 2 scientific papers (total in 2 papers)
Estimate of the Lebesgue Function of Fourier Sums in Terms of Modified Meixner Polynomials
R. M. Gadzhimirzaev Daghestan Scientific Centre of Russian Academy of Sciences, Makhachkala
Abstract:
The paper is devoted to the study of the approximation properties of Fourier sums in terms of the modified Meixner polynomials $m_{n,N}^\alpha(x)$, $n=0,1,\dots$, which generate, for $\alpha>-1$, an orthonormal system on the grid $\Omega_\delta=\{0,\delta,2\delta,\dots\}$ with weight
$$
\rho_N(x)=e^{-x}\frac{\Gamma(Nx+\alpha+1)}{\Gamma(Nx+1)} (1-e^{-\delta})^{\alpha+1},\qquad \text{where}\quad \delta=\frac{1}{N},\quad N\ge 1.
$$
The main attention is paid to the derivation of a pointwise estimate for the Lebesgue function $\lambda_{n,N}^\alpha(x)$ of Fourier sums in terms of the modified Meixner polynomials for $x\in[\theta_n/2,\infty)$ and $\theta_n=4n+2\alpha+2$.
Keywords:
Meixner polynomials, Fourier series, Lebesgue function.
Received: 12.10.2018
Citation:
R. M. Gadzhimirzaev, “Estimate of the Lebesgue Function of Fourier Sums in Terms of Modified Meixner Polynomials”, Mat. Zametki, 106:4 (2019), 519–530; Math. Notes, 106:4 (2019), 526–536
Linking options:
https://www.mathnet.ru/eng/mzm12216https://doi.org/10.4213/mzm12216 https://www.mathnet.ru/eng/mzm/v106/i4/p519
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