Sequences of partial sums of multiple trigonometric Fourier series

Let $f$ be an integrable $2\pi$-periodic function of $d\ge2$ variables. For a bounded subset $A$ of the $d$-dimensional space let $S_A(f)$ denote the sum of terms of the Fourier series of $f$ with frequencies in $A$. The following problem is addressed: given a sequence $\{A_j\}$ of bounded convex sets, do there exist a function $f$ and a sequence $\{j_\nu\}$ such that $\lim_{\nu\to\infty} |S_{A_{j_\nu}} (f)|=\infty$ almost everywhere? Bibliography: 5 titles.

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Publication Details

Journal
Sbornik Mathematics
Published
2025-01-01
DOI
https://doi.org/10.4213/sm10231e
Primary Topic
Differential Equations and Boundary Problems
Type
article
Field-Weighted Citation Impact
0.00

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article

Sequences of partial sums of multiple trigonometric Fourier series

Sergei Vladimirovich Konyagin
Sbornik Mathematics
Differential Equations and Boundary Problems
article

Sequences of partial sums of multiple trigonometric Fourier series

Sergei Vladimirovich Konyagin
article en

Abstract

Let $f$ be an integrable $2\pi$-periodic function of $d\ge2$ variables. For a bounded subset $A$ of the $d$-dimensional space let $S_A(f)$ denote the sum of terms of the Fourier series of $f$ with frequencies in $A$. The following problem is addressed: given a sequence $\{A_j\}$ of bounded convex sets, do there exist a function $f$ and a sequence $\{j_\nu\}$ such that $\lim_{\nu\to\infty} |S_{A_{j_\nu}} (f)|=\infty$ almost everywhere? Bibliography: 5 titles.

Sbornik MathematicsVol. 216(3)
Russian Academy of Sciences (RU), Lomonosov Moscow State University (RU), Steklov Mathematical Institute (RU)
Russian Science Foundation, Lomonosov Moscow State University
Openalex Percentile: Top 85%
Differential Equations and Boundary Problems
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