Isoperiodic families of Poncelet polygons inscribed in a circle and circumscribed about conics from a confocal pencil

Fuente: arXiv
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Autores principales: Dragović, Vladimir, Radnović, Milena
Formato: Preprint
Publicado: 2021
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author Dragović, Vladimir
Radnović, Milena
author_facet Dragović, Vladimir
Radnović, Milena
contents Poncelet polygons inscribed in a circle and circumscribed about conics from a confocal family naturally arise in the analysis of the numerical range and Blaschke products. We examine the behaviour of such polygons when the inscribed conic varies through a confocal pencil and discover cases when each conic from the confocal family is inscribed in an $n$-polygon, which is inscribed in the circle, with the same $n$. Complete geometric characterization of such cases for $n\in\{4,6\}$ is given and proved that this cannot happen for other values of $n$. We establish a relationship of such families of Poncelet quadrangles and hexagons to solutions of a Painlevé VI equation.
format Preprint
id arxiv_https___arxiv_org_abs_2103_01215
institution arXiv
publishDate 2021
record_format arxiv
spellingShingle Isoperiodic families of Poncelet polygons inscribed in a circle and circumscribed about conics from a confocal pencil
Dragović, Vladimir
Radnović, Milena
Dynamical Systems
Mathematical Physics
Algebraic Geometry
Exactly Solvable and Integrable Systems
14H70, 37J70, 34M55, 37A10
Poncelet polygons inscribed in a circle and circumscribed about conics from a confocal family naturally arise in the analysis of the numerical range and Blaschke products. We examine the behaviour of such polygons when the inscribed conic varies through a confocal pencil and discover cases when each conic from the confocal family is inscribed in an $n$-polygon, which is inscribed in the circle, with the same $n$. Complete geometric characterization of such cases for $n\in\{4,6\}$ is given and proved that this cannot happen for other values of $n$. We establish a relationship of such families of Poncelet quadrangles and hexagons to solutions of a Painlevé VI equation.
title Isoperiodic families of Poncelet polygons inscribed in a circle and circumscribed about conics from a confocal pencil
topic Dynamical Systems
Mathematical Physics
Algebraic Geometry
Exactly Solvable and Integrable Systems
14H70, 37J70, 34M55, 37A10
url https://arxiv.org/abs/2103.01215