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Des points fixes communs pour des difféomorphismes de ${ \mathbb{S} }^{2} $ qui commutent et préservent une mesure de probabilité

Published online by Cambridge University Press:  08 February 2013

F. Béguin
Affiliation:
Université Paris 13 Nord, France
P. Le Calvez
Affiliation:
Université Pierre-et-Marie-Curie, France
S. Firmo
Affiliation:
Universidade Federal Fluminense, Brésil
T. Miernowski
Affiliation:
Université de Aix-Marseille II, France

Résumé

Nous montrons des résultats d’existence de points fixes communs pour des homéomorphismes du plan ${ \mathbb{R} }^{2} $ ou la sphère ${ \mathbb{S} }^{2} $, qui commutent deux à deux et préservent une mesure de probabilité. Par exemple, nous montrons que des ${C}^{1} $-difféomorphismes ${f}_{1} , \ldots , {f}_{n} $ de ${ \mathbb{S} }^{2} $ suffisamment proches de l’identité, qui commutent deux à deux, et qui préservent une mesure de probabilité dont le support n’est pas réduit à un point, ont au moins deux points fixes communs.

Abstract

We prove the existence of common fixed points for some homeomorphisms of the plane ${ \mathbb{R} }^{2} $ or the two-sphere ${ \mathbb{S} }^{2} $ which commute and preserve a probability measure. For example, if ${f}_{1} , \ldots , {f}_{n} $ are commuting ${C}^{1} $-diffeomorphisms of ${ \mathbb{S} }^{2} $ that are sufficiently close to the identity, and that preserve a probability measure whose support is not a single point, then they have at least two common fixed points.

Type
Research Article
Copyright
©Cambridge University Press 2013 

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