Bidiagonal factorization of the recurrence matrix for the Hahn multiple orthogonal polynomials (Preprint)

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Type: Preprint
National /International: International
Title: Bidiagonal factorization of the recurrence matrix for the Hahn multiple orthogonal polynomials
Publication Date: 2023-08
Authors: - Amílcar Branquinho
- Juan E. F. Díaz
- Ana Foulquié-Moreno
- Manuel Mañas
Abstract:

This paper explores a factorization using bidiagonal matrices of the recurrence matrix of Hahn multiple orthogonal polynomials. The factorization is expressed in terms of ratios involving the generalized hypergeometric function \( _3F_2 \) and is proven using recently discovered contiguous relations. Moreover, employing the multiple Askey scheme, a bidiagonal factorization is derived for the Hahn descendants, including Jacobi-Piñeiro, multiple Meixner (kinds I and II), multiple Laguerre (kinds I and II), multiple Kravchuk, and multiple Charlier, all represented in terms of hypergeometric functions. For the cases of multiple Hahn, Jacobi-Piñeiro, Meixner of kind II, and Laguerre of kind I, where there exists a region where the recurrence matrix is nonnegative, subregions are identified where the bidiagonal factorization becomes a positive bidiagonal factorization.

Institution: arXiv:2308.01288
Online version: https://arxiv.org/abs/2308.01288
Download: Not available
 
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