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Sofic subshifts and piecewise isometric systems

Published online by Cambridge University Press:  01 December 1999

AREK GOETZ
Affiliation:
Department of Mathematics, Boston University, 111 Cummington Street, Boston, MA 02215, USA (e-mail: goetz@math.bu.edu) Current address: Department of Mathematics, San Francisco State University, 1600 Holloway Avenue, San Francisco, CA 94132, USA.
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Abstract

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We study the natural symbolic dynamics associated with piecewise continuous, non-invertible, dynamical systems. Our study is centered primarilyon the relationship between the point-set topological properties of the partition of the system and the symbolic coding. We prove that for a class of maps locally preserving distances with regular partition, the associatedsymbolic dynamics cannotembed subshifts of finite type of positive entropy. Hence, in particular, almost sofic subshifts obtained from the symbolic dynamics have zero entropy. However, there are examples in Euclidean spaces of systems with non-regular partitions for which the coding mapscan be surjective, particularly embedding all subshifts. For all such examples, the associated group of isometries is a subgroup of $O(\mathbb{R}, N)$.

Information

Type
Research Article
Copyright
1999 Cambridge University Press