Topologically completely positive entropy and zero-dimensional topologically completely positive entropy

RONNIE PAVLOV
2017 Ergodic Theory and Dynamical Systems  
In a previous paper [Pavlov, A characterization of topologically completely positive entropy for shifts of finite type. Ergod. Th. & Dynam. Sys. 34 (2014), 2054–2065], the author gave a characterization for when a $\mathbb{Z}^{d}$ -shift of finite type has no non-trivial subshift factors with zero entropy, a property which we here call zero-dimensional topologically completely positive entropy. In this work, we study the difference between this notion and the more classical topologically
more » ... pletely positive entropy of Blanchard. We show that there are one-dimensional subshifts and two-dimensional shifts of finite type which have zero-dimensional topologically completely positive entropy but not topologically completely positive entropy. In addition, we show that strengthening the hypotheses of the main result of Pavlov [A characterization of topologically completely positive entropy for shifts of finite type. Ergod. Th. & Dynam. Sys. 34 (2014), 2054–2065] yields a sufficient condition for a $\mathbb{Z}^{d}$ -shift of finite type to have topologically completely positive entropy.
doi:10.1017/etds.2016.120 fatcat:zvzrckxedrhkbguwfrudx6nv5q