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3 papers
On the almost everywhere convergence of sequences of multiple rectangular Fourier sums
N. Yu. Antonov Institute of Mathematics and Mechanics, Ural Branch of the Russian Academy of Sciences
Abstract:
In the case when a sequence of
$d$-dimensional vectors
$\mathrm n_k=(n_k^1,n_k^2,\dots,n_k^d)$ with nonnegative integer coordinates satisfies the condition
$$
n_k^j=\alpha_j m_k+O(1),\quad k\in\mathbb N,\quad1\le j\le d,
$$
where
$\alpha_1\dots\alpha_d>0$, а
$m_k\in\mathbb N$,
$\lim_{k\to\infty}m_k=\infty$, under some conditions on the function
$\varphi\colon[0,+\infty)\to[0,+\infty)$, it is proved that, if the trigonometric Fourier series of any function from
$\varphi(L)([-\pi,\pi))$ converges almost everywhere, then, for any
$d\in\mathbb N$ and all
$f\in\varphi(L)(\ln^+L)^{d-1}([-\pi,\pi)d)$, the sequence
$S_{\mathrm{n}_k}(f,\mathrm x)$ of the rectangular partial sums of the multiple trigonometric Fourier series of the function
$f$, as well as the corresponding sequences of partial sums of all of its conjugate series, converges almost everywhere.
UDC:
517.518 Received: 05.05.2008