Restrictions for order of q-monotone approximation of periodic functions

A continuous periodic $q$-monotone function, $q=3,...,$ is constructed for which if it is approximated with $q$-monotone polynomials the Jackson-Stechkin estimate with the modulus of smoothness of order $\ge q+2$ is not valid (in contrast with the approximation without restrictions).

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Bibliographische Detailangaben
Datum:2015
Hauptverfasser: Dzyubenko, G. A., Дзюбенко, Г. А.
Format: Artikel
Sprache:Ukrainisch
Veröffentlicht: Інститут математики НАН України 2015
Online Zugang:https://trim.imath.kiev.ua/index.php/trim/article/view/292
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Назва журналу:Transactions of Institute of Mathematics of NAS of Ukraine
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Transactions of Institute of Mathematics of NAS of Ukraine