Positive Bidiagonal Factorizations and Mixed-Type Chebyshev Multiple Orthogonal Polynomials
Year: 2026
Type: preprint
Abstract: We characterize when a semi-infinite banded totally positive matrix admits a positive bidiagonal factorization, without assuming boundedness, and establish criteria for stability under perturbations. These criteria distinguish whether the initial factor entries are fixed or allowed to vary. For banded totally positive Toeplitz matrices, such factorizations always exist; a factorization can be chosen to depend analytically on all sufficiently small perturbations within the same band if and only if the polynomial symbol has distinct roots. Explicit root formulas determine the associated mixed-type multiple orthogonal polynomials and their matrix of positive measures. They also yield scalar linear forms independent of the chosen factorization, from which we obtain asymptotic zero spacing and sine-kernel limits. We further treat finite boundary modifications and limiting zero distributions for matrices with convergent diagonals.
Source: arXiv (Cornell University)
Author: Mañas, Manuel
Institution: Universidad Complutense de Madrid
Language: English
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7221044582