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Matematicheskie Zametki, 2002, Volume 72, Issue 6, Pages 892–908
DOI: https://doi.org/10.4213/mzm475
(Mi mzm475)
 

This article is cited in 4 scientific papers (total in 4 papers)

On the Decay of Infinite Products of Trigonometric Polynomials

V. Yu. Protasov

M. V. Lomonosov Moscow State University
Full-text PDF (276 kB) Citations (4)
References:
Abstract: We consider infinite products of the form $f(\xi )=\prod _{k=1}^\infty m_k(2^{-k}\xi )$, where $\{m_k\}$ is an arbitrary sequence of trigonometric polynomials of degree at most $n$ with uniformly bounded norms such that $m_k(0)=1$ for all $k$. We show that $f(\xi )$ can decrease at infinity not faster than $O(\xi ^{-n})$ and present conditions under which this maximal decay is attained. This result can be applied to the theory of nonstationary wavelets and nonstationary subdivision schemes. In particular, it restricts the smoothness of nonstationary wavelets by the length of their support. This also generalizes well-known similar results obtained for stable sequences of polynomials (when all ${m_k}$ coincide). By means of several examples, we show that by weakening the boundedness conditions one can achieve exponential decay.
Received: 25.07.2001
Revised: 29.04.2002
English version:
Mathematical Notes, 2002, Volume 72, Issue 6, Pages 819–832
DOI: https://doi.org/10.1023/A:1021442030017
Bibliographic databases:
UDC: 517.5
Language: Russian
Citation: V. Yu. Protasov, “On the Decay of Infinite Products of Trigonometric Polynomials”, Mat. Zametki, 72:6 (2002), 892–908; Math. Notes, 72:6 (2002), 819–832
Citation in format AMSBIB
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  • This publication is cited in the following 4 articles:
    Citing articles in Google Scholar: Russian citations, English citations
    Related articles in Google Scholar: Russian articles, English articles
    Математические заметки Mathematical Notes
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