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Sbornik: Mathematics, 2000, Volume 191, Issue 1, Pages 97–120
DOI: https://doi.org/10.1070/sm2000v191n01ABEH000449
(Mi sm449)
 

This article is cited in 39 scientific papers (total in 40 papers)

On everywhere divergence of trigonometric Fourier series

S. V. Konyagin

M. V. Lomonosov Moscow State University
References:
Abstract: The following theorem is established.
Theorem. {\it Let a function $\varphi\colon[0,+\infty)\to[0,+\infty)$ and a sequence $\{\psi(m)\}$ satisfy the following condition: the function $\varphi(u)/u$ is non-decreasing on $(0,+\infty)$, $\psi(m)\geqslant 1$ $(m=1,2,\dots)$ and $\varphi(m)\psi(m)=o(m\sqrt{\ln m}/\sqrt{\ln\ln m}\,)$ as $m\to\infty$. Then there is a function $f\in L[-\pi,\pi]$ such that
$$ \int _{-\pi}^\pi\varphi(|f(x)|)\,dx<\infty $$
and $\limsup_{m\to\infty}S_m(f,x)/\psi(m)=\infty$ for all $x\in[-\pi,\pi]$ here $S_m(f)$ is the $m$-th partial sum of the trigonometric Fourier series of $f$}.
Received: 11.06.1999
Bibliographic databases:
Document Type: Article
UDC: 517.518.45
MSC: 42a20
Language: English
Original paper language: Russian
Citation: S. V. Konyagin, “On everywhere divergence of trigonometric Fourier series”, Sb. Math., 191:1 (2000), 97–120
Citation in format AMSBIB
\Bibitem{Kon00}
\by S.~V.~Konyagin
\paper On everywhere divergence of trigonometric Fourier series
\jour Sb. Math.
\yr 2000
\vol 191
\issue 1
\pages 97--120
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  • https://www.mathnet.ru/eng/sm/v191/i1/p103
  • This publication is cited in the following 40 articles:
    Citing articles in Google Scholar: Russian citations, English citations
    Related articles in Google Scholar: Russian articles, English articles
    Математический сборник - 1992–2005 Sbornik: Mathematics
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    Abstract page:1132
    Russian version PDF:441
    English version PDF:47
    References:102
    First page:4
     
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