Hostname: page-component-848d4c4894-4rdrl Total loading time: 0 Render date: 2024-06-23T02:12:45.812Z Has data issue: false hasContentIssue false

Topological entropy of m-fold maps

Published online by Cambridge University Press:  09 February 2005

JOZEF BOBOK
Affiliation:
KM FSv. ČVUT, Thákurova 7, 166 29 Praha 6, Czech Republic (e-mail: bobok@mat.fsv.cvut.cz)
ZBIGNIEW NITECKI
Affiliation:
Department of Mathematics, Tufts University, Medford, MA 02155, USA (e-mail: zbigniew.nitecki@tufts.edu)

Abstract

We investigate the relation between preimage multiplicity and topological entropy for continuous maps. An argument originated by Misiurewicz and Przytycki shows that if every regular value of a C1 map has at least m preimages then the topological entropy of the map is at least log m. For every integer, there exist continuous maps of the circle with entropy 0 for which every point has at least m preimages. We show that if in addition there is a positive uniform lower bound on the diameter of all pointwise preimage sets, then the entropy is at least log m.

Type
Research Article
Copyright
2005 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)