摘要：In the present work, we emphasize, for the first time, the error estimation of a two-variable function $g(y,z)$ in the generalized Zygmund class $Y_{r}^{(\xi )}$ ( $r\geq 1$) using the double Hausdorff matrix means of its double Fourier series. In fact, in this work, we establish two theorems on error estimation of a two-variable function of g in the generalized Zygmund class.
