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This article is cited in 6 scientific papers (total in 6 papers)
A quantitative version of the Beurling-Helson theorem
S. V. Konyaginab, I. D. Shkredovca a Steklov Mathematical Institute of Russian Academy of Sciences
b Lomonosov Moscow State University, Faculty of Mechanics and Mathematics
c Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute), Moscow
Abstract:
It is proved that any continuous function $\varphi$ on the unit circle such that the sequence $\{e^{in\varphi}\}_{n\in\mathbb{Z}}$ has small Wiener norm $\|e^{in\varphi}\| = o(\log^{1/22}|n|(\log \log |n|)^{-3/11})$, $|n| \to \infty$, is linear. Moreover, lower bounds for the Wiener norms of the characteristic functions of subsets of $\mathbb{Z}_p$ in the case of prime $p$ are obtained.
Keywords:
Wiener norm, Beurling-Helson theorem, dissociated sets.
Received: 14.01.2014
Citation:
S. V. Konyagin, I. D. Shkredov, “A quantitative version of the Beurling-Helson theorem”, Funktsional. Anal. i Prilozhen., 49:2 (2015), 39–53; Funct. Anal. Appl., 49:2 (2015), 110–121
Linking options:
https://www.mathnet.ru/eng/faa3185https://doi.org/10.4213/faa3185 https://www.mathnet.ru/eng/faa/v49/i2/p39
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