No Jackson-type estimates for piecewise $q$-monotone, $q\ge3$, trigonometric approximation von Leviatan , D., Motorna, O. V., Shevchuk, I. A., Leviatan , D., Motorna, O. V., Shevchuk, I. A., Шевчук, Ігор

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Application of the even-type delayed mean in the approximation of functions from the generalized Zygmund class with weight von Krasniqi, Xhevat Z., Krasniqi, Xhevat Z.

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