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Matematicheskie Zametki, 2005, Volume 77, Issue 6, Pages 861–876
DOI: https://doi.org/10.4213/mzm2543
(Mi mzm2543)
 

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

On the Rate of Approximation of Closed Jordan Curves by Lemniscates

O. N. Kosukhin

M. V. Lomonosov Moscow State University
Full-text PDF (240 kB) Citations (4)
References:
Abstract: As proved by Hilbert, it is, in principle, possible to construct an arbitrarily close approximation in the Hausdorff metric to an arbitrary closed Jordan curve $\Gamma$ in the complex plane $\{z\}$ by lemniscates generated by polynomials $P(z)$. In the present paper, we obtain quantitative upper bounds for the least deviations $H_n(\Gamma)$ (in this metric) from the curve $\Gamma$ of the lemniscates generated by polynomials of a given degree $n$ in terms of the moduli of continuity of the conformal mapping of the exterior of $\Gamma$ onto the exterior of the unit circle, of the mapping inverse to it, and of the Green function with a pole at infinity for the exterior of $\Gamma$. For the case in which the curve $\Gamma$ is analytic, we prove that $H_n(\Gamma)=O(q^n)$, $0\le q=q(\Gamma)<1$, $n\to\infty$.
Received: 06.11.2003
English version:
Mathematical Notes, 2005, Volume 77, Issue 6, Pages 794–808
DOI: https://doi.org/10.1007/s11006-005-0080-5
Bibliographic databases:
UDC: 517.54
Language: Russian
Citation: O. N. Kosukhin, “On the Rate of Approximation of Closed Jordan Curves by Lemniscates”, Mat. Zametki, 77:6 (2005), 861–876; Math. Notes, 77:6 (2005), 794–808
Citation in format AMSBIB
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  • https://doi.org/10.4213/mzm2543
  • https://www.mathnet.ru/eng/mzm/v77/i6/p861
  • 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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