2017
Том 69
№ 9

All Issues

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

Hembars'ka S. B.

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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.

English version (Springer): Ukrainian Mathematical Journal 55 (2003), no. 6, pp 885-904.

Citation Example: Hembars'ka S. B. Estimates for the Variation of Functions Defined by Double Trigonometric Cosine Series // Ukr. Mat. Zh. - 2003. - 55, № 6. - pp. 733-749.

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