We obtain a criterion for the validity of weak generalized localization almost everywhere on an arbitrary set of positive measure \documentclass[12pt]{minimal}
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\begin{document}$$\mathfrak{A}$$\end{document}, \documentclass[12pt]{minimal}
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\begin{document}$$\mathfrak{A} \subset \mathbb{I}^N = \{ x \in \mathbb{R}^N :0 \leqslant x_j < 1,j = 1,2, \ldots ,N\}$$\end{document}, N ≥ 3 (in terms of the structure and geometry of the set \documentclass[12pt]{minimal}
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\begin{document}$$\mathfrak{A}$$\end{document}), for multiple Walsh-Fourier series (summed over rectangles) of functions f in the classes \documentclass[12pt]{minimal}
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\begin{document}$$L_p (\mathbb{I}^N )$$\end{document}, p > 1 (i.e., necessary and sufficient conditions for the convergence almost everywhere of the Fourier series on some subset of positive measure \documentclass[12pt]{minimal}
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\begin{document}$$\mathfrak{A}_1$$\end{document} of the set \documentclass[12pt]{minimal}
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\begin{document}$$\mathfrak{A}$$\end{document}, when the function expanded in a series equals zero on \documentclass[12pt]{minimal}
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\begin{document}$$\mathfrak{A}$$\end{document}), in the case when the rectangular partial sums Sn(x; f) of this series have indices n = (n1, …, nN) ∈ ℤN in which some components are elements of (single) lacunary sequences.