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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