On the joint approximation of a function and its derivatives in the mean von O. V. Motorna, V. P. Motornyi

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On an asymptotic equality proved by Revers von O. V. Motorna, V. I. Shevchuk

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No Jackson-type estimates for piecewise q-monotone, q≥3, trigonometric approximation von D. Leviatan, O. V. Motorna, I. A. Shevchuk

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