Residual entropy, conditional entropy and subshift covers

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Abstract
We study the existence of subshift covers for topological dynamical systems, the inflmum of the entropy jumps to such covers, and various aspects of conditional entropy and covering maps including a variational principle for covering maps. In particular we show every asymptotically h-expansive system (and therefore by Buzzi every C 1 homeomorphism of a compact Riemannian manifold) has a subshift cover of equal entropy. Our arguments in dimension zero are extended to higher dimension with theorems of Kulesza and Thomsen.

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