A classification of minimal sets of torus homeomorphisms

Autor: Tobias Jaeger, Ferry Kwakkel, Alejandro Passeggi
Rok vydání: 2012
Předmět:
Zdroj: Mathematische Zeitschrift. 274:405-426
ISSN: 1432-1823
0025-5874
DOI: 10.1007/s00209-012-1076-y
Popis: We provide a classification of minimal sets of homeomorphisms of the two-torus, in terms of the structure of their complement. We show that this structure is exactly one of the following types: (1) a disjoint union of topological disks, or (2) a disjoint union of essential annuli and topological disks, or (3) a disjoint union of one doubly essential component and bounded topological disks. Periodic bounded disks can only occur in type 3. This result provides a framework for more detailed investigations, and additional information on the torus homeomorphism allows to draw further conclusions. In the non-wandering case, the classification can be significantly strengthened and we obtain that a minimal set other than the whole torus is either a periodic orbit, or the orbit of a periodic circloid, or the extension of a Cantor set. Further special cases are given by torus homeomorphisms homotopic to an Anosov, in which types 1 and 2 cannot occur, and the same holds for homeomorphisms homotopic to the identity with a rotation set which has non-empty interior. If a non-wandering torus homeomorphism has a unique and totally irrational rotation vector, then any minimal set other than the whole torus has to be the extension of a Cantor set.
Comment: Published in Mathematische Zeitschrift, June 2013, Volume 274, Issue 1-2, pp 405-426
Databáze: OpenAIRE
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