The convergence of hulls of curves

It is shown that a simple closed curve in \(\mathbb C^n\) that is a uniform limit of rectifiable simple closed curves each of which has nontrivial polynomial hull has itself nontrivial polynomial hull. In case the limit curve is rectifiable, the hull of the limit is shown to be the limit of the hull...

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Bibliographic Details
Published in:arXiv.org 2021-05
Main Authors: Izzo, Alexander J, Edgar Lee Stout
Format: Article
Language:English
Subjects:
Hulls
Polynomials
Online Access:Get full text
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Summary:It is shown that a simple closed curve in \(\mathbb C^n\) that is a uniform limit of rectifiable simple closed curves each of which has nontrivial polynomial hull has itself nontrivial polynomial hull. In case the limit curve is rectifiable, the hull of the limit is shown to be the limit of the hulls. It is also shown that every rectifiable simple closed curve in \(\mathbb C^n\), \(n\geq 2\), can be approximated in total variation norm by a polynomially convex, rectifiable simple closed curve that coincides with the original curve except on an arbitrarily small segment. As a corollary, it is shown that every rectifiable arc in \(\mathbb C^n\), \(n\geq 2\), is contained in a polynomially convex, rectifiable simple closed curve.
ISSN:2331-8422