A note on homotopies of rational matrix inner functions

We show that when <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="m greater-than n"> <mml:semantics> <mml:mrow> <mml:mi>m</mml:mi> <mml:mo>&gt;</mml:mo> <mml:mi>n</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">m&gt;n</mml:annotation> </mml:semantics> </mml:math> </inline-formula> , the space of <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="m times n"> <mml:semantics> <mml:mrow> <mml:mi>m</mml:mi> <mml:mo> × </mml:mo> <mml:mi>n</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">m\times n</mml:annotation> </mml:semantics> </mml:math> </inline-formula> -matrix-valued rational inner functions in the disk is path connected.

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Publication Details

Journal
Proceedings of the American Mathematical Society
Published
2026-01-15
DOI
https://doi.org/10.1090/proc/17549
Primary Topic
Analytic and geometric function theory
Type
article
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article

A note on homotopies of rational matrix inner functions

Michael T. Jury
Proceedings of the American Mathematical Society
Analytic and geometric function theory
article

A note on homotopies of rational matrix inner functions

Michael T. Jury
article en

Abstract

We show that when <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="m greater-than n"> <mml:semantics> <mml:mrow> <mml:mi>m</mml:mi> <mml:mo>&gt;</mml:mo> <mml:mi>n</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">m&gt;n</mml:annotation> </mml:semantics> </mml:math> </inline-formula> , the space of <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="m times n"> <mml:semantics> <mml:mrow> <mml:mi>m</mml:mi> <mml:mo> × </mml:mo> <mml:mi>n</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">m\times n</mml:annotation> </mml:semantics> </mml:math> </inline-formula> -matrix-valued rational inner functions in the disk is path connected.

Proceedings of the American Mathematical SocietyVol. 154(4)
University of Florida (US)
Openalex Percentile: Top 83%
Analytic and geometric function theory
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