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JOURNALS // Trudy Matematicheskogo Instituta imeni V.A. Steklova // Archive

Trudy Mat. Inst. Steklova, 2014 Volume 285, Pages 41–63 (Mi tm3547)

This article is cited in 1 paper

A weak generalized localization criterion for multiple Walsh–Fourier series with $J_k$-lacunary sequence of rectangular partial sums

S. K. Bloshanskayaa, I. L. Bloshanskiib

a National Engineering Physics Institute "MEPhI", Moscow, Russia
b Moscow State Region University, Moscow, Russia

Abstract: We obtain a criterion for the validity of weak generalized localization almost everywhere on an arbitrary set of positive measure $\mathfrak A$, $\mathfrak A\subset\mathbb I^N=\{x\in\mathbb R^N\colon0\leq x_j<1,\, j=1,2,\dots,N\}$, $N\geq3$ (in terms of the structure and geometry of the set $\mathfrak A$), for multiple Walsh–Fourier series (summed over rectangles) of functions $f$ in the classes $L_p(\mathbb I^N)$, $p>1$ (i.e., necessary and sufficient conditions for the convergence almost everywhere of the Fourier series on some subset of positive measure $\mathfrak A_1$ of the set $\mathfrak A$, when the function expanded in a series equals zero on $\mathfrak A$), in the case when the rectangular partial sums $S_n(x;f)$ of this series have indices $n=(n_1,\dots,n_N)\in\mathbb Z^N$ in which some components are elements of (single) lacunary sequences.

UDC: 517.5

Received in September 2013

DOI: 10.1134/S0371968514020058


 English version:
Proceedings of the Steklov Institute of Mathematics, 2014, 285, 34–55

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