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Sbornik: Mathematics, 2021, Volume 212, Issue 11, Pages 1626–1659
DOI: https://doi.org/10.1070/SM9024
(Mi sm9024)
 

This article is cited in 1 scientific paper (total in 1 paper)

Convergence of two-point Padé approximants to piecewise holomorphic functions

M. L. Yattselevab

a Department of Mathematical Sciences, Indiana University – Purdue University Indianapolis, Indianapolis, IN, USA
b Keldysh Institute of Applied Mathematics of Russian Academy of Sciences, Moscow, Russia
References:
Abstract: Let $f_0$ and $f_\infty$ be formal power series at the origin and infinity, and $P_n/Q_n$, $\deg(P_n),\deg(Q_n)\leq n$, be the rational function that simultaneously interpolates $f_0$ at the origin with order $n$ and $f_\infty$ at infinity with order ${n+1}$. When germs $f_0$ and $f_\infty$ represent multi-valued functions with finitely many branch points, it was shown by Buslaev that there exists a unique compact set $F$ in the complement of which the approximants converge in capacity to the approximated functions. The set $F$ may or may not separate the plane. We study uniform convergence of the approximants for the geometrically simplest sets $F$ that do separate the plane.
Bibliography: 26 titles.
Keywords: two-point Padé approximants, non-Hermitian orthogonality, strong asymptotics, $S$-contours, matrix Riemann-Hilbert approach.
Funding agency Grant number
Simons Foundation CGM-354538
Ministry of Science and Higher Education of the Russian Federation 075-15-2019-1623
This research was supported by the Simons Foundation (grant no. CGM-354538), and by the Moscow Center for Fundamental and Applied Mathematics, under agreement no. 075-15-2019-1623 with the Ministry of Science and Higher Education of the Russian Federation.
Received: 24.10.2017 and 27.04.2021
Russian version:
Matematicheskii Sbornik, 2021, Volume 212, Number 11, Pages 128–164
DOI: https://doi.org/10.4213/sm9024
Bibliographic databases:
Document Type: Article
UDC: 517.53
MSC: 42C05, 41A20, 41A21
Language: English
Original paper language: Russian
Citation: M. L. Yattselev, “Convergence of two-point Padé approximants to piecewise holomorphic functions”, Mat. Sb., 212:11 (2021), 128–164; Sb. Math., 212:11 (2021), 1626–1659
Citation in format AMSBIB
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  • https://www.mathnet.ru/eng/sm9024
  • https://doi.org/10.1070/SM9024
  • https://www.mathnet.ru/eng/sm/v212/i11/p128
  • This publication is cited in the following 1 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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