Approximation in the mean of the classes of functions in the space $L_2[(0,1);x]$ by the Fourier–Bessel sums and estimates of the values of their $n$-widths von Vakarchuk, S., Vakarchuk, M., Вакарчук, Сергій, Вакарчук, Михайло

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Averaged characteristics of smoothness in $L_2$ and estimations for the widths values of function classes von Vakarchuk, S., Zabutna , V., Vakarchuk, M., Вакарчук, Сергій, Забутна, Валентина, Вакарчук, Михайло

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Exact values of widths for the classes of functions defined by the averaged smoothness characteristics and majorants in the space $L_2$ von Vakarchuk, S., Zabutna, V., Vakarchuk, M., Вакарчук, Сергій, Забутна, Валентина, Вакарчук, Михайло

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