A note on a paper of H. Alzer and S. Koumandos.
Wang, Kunyang (2006)
JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
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Wang, Kunyang (2006)
JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
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We investigate approximation properties of de la Vallee Poussin right-angled sums on the classes of periodic functions of several variables with a high smoothness. We obtain integral presentations of deviations of de la Vallee Poussin sums on the classes .
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