Tail Invariant Measures of the Dyck Shift

Abstract

We show that the one-sided Dyck shift has a unique tail invariant topologically $\sigma$-finite measure (up to scaling). This invariant measure of the one sided Dyck turns out to be a shift-invariant probability. Furthermore, it is one of the two ergodic probabilities obtaining maximal entropy. For the two sided Dyck shift we show that there are exactly three ergodic double-tail invariant probabilities. We show that the two sided Dyck has a double-tail invariant probability, which is also shift invariant, with entropy strictly less than the topological entropy.Comment: Replaces old version of this article and also of math.DS/0408201. To appear in Israel J. of Math. This article is a part of the author's M.Sc. thesis, written under the supervision of J. Aaronson, Tel-Aviv Universit