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Let be a topological dynamical system (TDS), and the topological entropy of a subset of . is {\it lowerable} if for each there is a non-empty compact subset with entropy ; is {\it hereditarily lowerable} if each non-empty compact subset is lowerable; is {\it hereditarily uniformly lowerable} if for each non-empty compact subset and each there is a non-empty compact subset with and has at most one limit point. It is shown that each TDS with finite entropy is lowerable, and that a TDS is hereditarily uniformly lowerable if and only if it is asymptotically -expansive.

生成讲解博客的中文版本

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