Indices of the iterates of R3-homeomorphisms at fixed points which are isolated invariant sets
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Autores: Patrice Le Calvez, Francisco Romero Ruiz del Portal
, José M. Salazar
- Localización: Journal of the London Mathematical Society, ISSN 0024-6107, Vol. 82, Nº 3, 2010, págs. 663-696
- Idioma: inglés
- DOI: 10.1112/jlms/jdq050
- Enlaces
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Resumen
Let U �¼ R3 be an open set and f : U �¨ f(U) �¼ R3 be a homeomorphism. Let p �¸ U be a fixed point. It is known that if {p} is not an isolated invariant set, then the sequence of the fixedpoint indices of the iterates of f at p, (i(fn, p))n1, is, in general, unbounded. The main goal of this paper is to show that when {p} is an isolated invariant set, the sequence (i(fn, p))n1 is periodic. Conversely, we show that, for any periodic sequence of integers (In)n1 satisfying Dold�fs necessary congruences, there exists an orientation-preserving homeomorphism such that i(fn, p) = In for every n 1. Finally we also present an application to the study of the local structure of the stable/unstable sets at p.
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