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Matematicheskie Zametki, 2021, Volume 110, Issue 4, Pages 592–597
DOI: https://doi.org/10.4213/mzm13157
(Mi mzm13157)
 

This article is cited in 2 scientific papers (total in 2 papers)

Two Examples Related to Properties of Discrete Measures

S. P. Suetin

Steklov Mathematical Institute of Russian Academy of Sciences, Moscow
Full-text PDF (452 kB) Citations (2)
References:
Abstract: Two examples illustrating properties of discrete measures are given. In the first part of the paper, it is proved that, for any probability measure $\mu$ with $\operatorname{supp}{\mu}=[-1,1]$ whose logarithmic potential is continuous on $[-1,1]$, there exists a (discrete) measure $\sigma=\sigma(\mu)$ with $\operatorname{supp}{\sigma}=[-1,1]$ such that the corresponding orthogonal polynomials $P_n(x;\sigma)=x^n+\dotsb$ satisfy the condition $(1/n)\chi(P_n(\,\cdot\,;\sigma))\xrightarrow{*}\mu$, $n\to\infty$, where $\chi(\,\cdot\,)$ is the measure counting the zeros of a polynomial. The proof of the existence of such a measure $\sigma$ is based on properties of weighted Leja points. In the second part, an example of a compact set and a sequence of discrete measures supported on it with a special property is given. Namely, the sequence of measures converges in the $*$-weak topology to the equilibrium measure on the compact set, but the corresponding sequence of logarithmic potentials converges in capacity to the equilibrium potential in no neighborhood of this compact set.
Keywords: orthogonal polynomial, discrete measure, logarithmic potential, convergence in capacity.
Funding agency Grant number
Russian Science Foundation 19-11-00316
This work was supported by the Russian Science Foundation under grant 19-11-00316.
Received: 22.05.2021
English version:
Mathematical Notes, 2021, Volume 110, Issue 4, Pages 578–582
DOI: https://doi.org/10.1134/S0001434621090285
Bibliographic databases:
Document Type: Article
UDC: 517.5
Language: Russian
Citation: S. P. Suetin, “Two Examples Related to Properties of Discrete Measures”, Mat. Zametki, 110:4 (2021), 592–597; Math. Notes, 110:4 (2021), 578–582
Citation in format AMSBIB
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  • https://doi.org/10.4213/mzm13157
  • https://www.mathnet.ru/eng/mzm/v110/i4/p592
  • This publication is cited in the following 2 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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