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.
Authors
- Sergei Vladimirovich Konyagin (ORCID: https://orcid.org/0000-0002-9669-5446)
Institutions
- Russian Academy of Sciences (RU)
- Lomonosov Moscow State University (RU)
- Steklov Mathematical Institute (RU)
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
Funders
- Russian Science Foundation
- Lomonosov Moscow State University