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2021 | OriginalPaper | Buchkapitel

A Survey on Markov’s Theorem on Zeros of Orthogonal Polynomials

verfasst von : Kenier Castillo, Marisa de Souza Costa, Fernando Rodrigo Rafaeli

Erschienen in: Nonlinear Analysis and Global Optimization

Verlag: Springer International Publishing

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Abstract

This manuscript is an extended version of the paper by the same authors who appeared in Castillo et al. (Appl Math Comput 339:390–397, 2018). It briefly surveys a Markov’s result dating back to the end of the nineteenth century, which is related to zeros of orthogonal polynomials.

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Fußnoten
1
The Dirac measure δ y is a positive Radon measure whose support is the set {y}.
 
2
In the case that ω(x, t) is an even function in an interval of the form (−a, a), it is well known that the zeros of the orthogonal polynomials are symmetric with respect to the origin, i.e., x k(t) = −x nk+1(t), k = 1,  2, …, n.
 
3
\(A^{c}:=\{x\in \mathbb {R}\,|\,x\not \in A\)} and Co(A) denotes the convex hull of A.
 
4
Because of the symmetry of the zeros of \(P_{n}^{(\lambda )}(x)\), its negative zeros are increasing functions of λ, for λ > −1∕2.
 
5
One has the identity \(\displaystyle \frac {\Gamma '(z)}{\Gamma (z)}=-\gamma -\frac {1}{z}-\sum _{n=1}^{\infty }\left [\frac {1}{z+n}-\frac {1}{n} \right ]\), where γ is the Euler constant (see [34, Section 12.3], [31, Chapter 7]).
 
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Metadaten
Titel
A Survey on Markov’s Theorem on Zeros of Orthogonal Polynomials
verfasst von
Kenier Castillo
Marisa de Souza Costa
Fernando Rodrigo Rafaeli
Copyright-Jahr
2021
DOI
https://doi.org/10.1007/978-3-030-61732-5_2