The multiple Markov theorem on Angelesco sets

K. Castillo; G. Gordillo-Núñez

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arXiv · 2502.04992

The multiple Markov theorem on Angelesco sets

K. Castillo·G. Gordillo-Núñez

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Abstract

Addressing a problem described by Ismail as a "worthwhile research project", this note extends Markov's theorem to multiple orthogonal polynomials on Angelesco sets. The interaction $\mathcal{Z}$-matrix is shown to be a nonsingular $\mathcal{M}$-matrix; hence the theorem holds for positive Borel measures satisfying the natural support condition, including finite supports, without restriction on the number of intervals. Beyond separated supports, a dual variation identity gives necessary and sufficient tail conditions. An explicit AT example disproves the componentwise extension, while for Nikishin systems we prove positive results for certain deformations of the first generator and give a counterexample for an internal generator.

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BibTeX RIS

K. Castillo, G. Gordillo-Núñez. 2025-02-07. The multiple Markov theorem on Angelesco sets. https://arxiv.org/abs/2502.04992

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