2019
Том 71
№ 2

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

Abstract

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

Citation Example: Hembars'ka S. B., Zaderei P. V. Estimations of the integral of modulus for mixed derivatives of the sum of double trigonometric series // Ukr. Mat. Zh. - 2016. - 68, № 7. - pp. 908-921.