Classes $\Lambda^{m,n} (\psi, p, r)$ and Double Trigonometric Fourier series

Xhevat Z. Krasniqi


In this paper we generalize the Lipschitz
classes $\Lambda^{m,n} (\alpha, \beta, p, r)$ defined in \cite{A6}. Here
separately are given, necessary and sufficient conditions, so that
a function with double Fourier series belongs the generalized
classes $\Lambda^{m,n} (\psi ,p, r)$

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