Approximation of the classes of generalized Poisson integrals by Fourier sums in metrics of the spaces $L_s$ von Serdyuk, A. S., Stepanyuk, T. A., Сердюк, А. С., Степанюк, Т. А.

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Order Estimates for the Best Orthogonal Trigonometric Approximations of the Classes of Convolutions of Periodic Functions of Low Smoothness von Serdyuk, A. S., Stepanyuk, T. A., Сердюк, А. С., Степанюк, Т. А.

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Estimations of the Best Approximations for the Classes of Infinitely Differentiable Functions in Uniform and Integral Metrics von Serdyuk, A. S., Stepanyuk, T. A., Сердюк, А. С., Степанюк, Т. А.

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Order Estimates for the Best Approximations and Approximations by Fourier Sums in the Classes of Convolutions of Periodic Functions of Low Smoothness in the Uniform Metric von Serdyuk, A. S., Stepanyuk, T. A., Сердюк, А. С., Степанюк, Т. А.

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On the approximation of the classes $W_{β}^rH^{α}$ by biharmonic Poisson integrals von Hrabova, U. Z., Kalchuk, I. V., Stepanyuk, T. A., Грабова, У. З., Кальчук, І. В., Степанюк, Т. А.

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Approximation of functions from the classes $W_{β}^r H^{α }$ by Weierstrass integrals von Hrabova, U. Z., Kalchuk, I. V., Stepanyuk, T. A., Грабова, У. З., Кальчук, І. В., Степанюк, Т. А.

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