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Estimations of the integral of modulus for mixed derivatives of the sum of double trigonometric series

For functions of two variables defined by trigonometric series with quasiconvex coefficients, we estimate their variations in the Hardy – Vitali sense.

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Bibliographic Details
Date:	2016
Main Authors:	Hembars'ka, S. B., Zaderei, P. V., Гембарська, С. В, Задерей, П. В.
Format:	Article
Language:	Ukrainian
Published:	Institute of Mathematics, NAS of Ukraine 2016
Online Access:	https://umj.imath.kiev.ua/index.php/umj/article/view/1890
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Journal Title:	Ukrains’kyi Matematychnyi Zhurnal
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