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Two results on entropy, chaos and independence in symbolic dynamics

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  • We survey the connections between entropy, chaos, and independence in topological dynamics. We present extensions of two classical results placing the following notions in the context of symbolic dynamics:
        1. Equivalence of positive entropy and the existence of a large (in terms of asymptotic and Shnirelman densities) set of combinatorial independence for shift spaces.
        2. Existence of a mixing shift space with a dense set of periodic points with topological entropy zero and without ergodic measure with full support, nor any distributionally chaotic pair.
    Our proofs are new and yield conclusions stronger than what was known before.
    Mathematics Subject Classification: 37B40, 37B10.


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