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The local rotation set is an interval

Published online by Cambridge University Press:  04 May 2017

JONATHAN CONEJEROS*
Affiliation:
Institut de Mathématiques de Jussieu – Paris Rive Gauche, UPMC, 4 place Jussieu, Case 247, 75252 Paris Cedex 5, France email jaconeje@uc.cl
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Abstract

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Let $\text{Homeo}_{0}(\mathbb{R}^{2};0)$ be the set of all homeomorphisms of the plane that are isotopic to the identity and which fix zero. Recently, in Le Roux [L’ensemble de rotation autour d’un point fixe. Astérisque (350) (2013), 1–109], Le Roux gave the definition of the local rotation set of an isotopy$I$ in $\text{Homeo}_{0}(\mathbb{R}^{2};0)$ from the identity to a homeomorphism $f$ and he asked if this set is always an interval. In this article, we give a positive answer to this question and to the analogous question in the case of the open annulus.

Information

Type
Original Article
Copyright
© Cambridge University Press, 2017