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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Gembarskaya, S.B. Estimates for the Variation of Functions Defined by Double Trigonometric Cosine Series. Ukrainian Mathematical Journal 55, 885–904 (2003). https://doi.org/10.1023/B:UKMA.0000010591.55696.30
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DOI: https://doi.org/10.1023/B:UKMA.0000010591.55696.30