Estimates for the Variation of Functions Defined by Double Trigonometric Cosine Series

Author： Gembarskaya S. B.  

Publisher： Springer Publishing Company

ISSN： 0041-5995

Source： Ukrainian Mathematical Journal, Vol.55, Iss.6, 2003-06, pp. : 885-904

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Abstract

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

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