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The geometric index and attractors of homeomorphisms of $\mathbb {R}^3$

Published online by Cambridge University Press:  18 October 2021

H. BARGE
Affiliation:
E.T.S. Ingenieros informáticos, Universidad Politécnica de Madrid, 28660 Madrid, España (e-mail: h.barge@upm.es)
J. J. SÁNCHEZ-GABITES*
Affiliation:
Facultad de Ciencias Matemáticas, Universidad Complutense de Madrid, 28040 Madrid, España
*

Abstract

In this paper we focus on compacta $K \subseteq \mathbb {R}^3$ which possess a neighbourhood basis that consists of nested solid tori $T_i$ . We call these sets toroidal. Making use of the classical notion of the geometric index of a curve inside a torus, we introduce the self-geometric index of a toroidal set K, which roughly captures how each torus $T_{i+1}$ winds inside the previous $T_i$ as $i \rightarrow +\infty $ . We then use this index to obtain some results about the realizability of toroidal sets as attractors for homeomorphisms of $\mathbb {R}^3$ .

Type
Original Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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