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arXiv 1208.2783nlin.CGcs.FLmath.GN
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元胞自动机的拓扑启发问题及拓扑学中的一个反例

Topology Inspired Problems for Cellular Automata, and a Counterexample in Topology

Ville Salo, Ilkka Törmä

摘要:

我们考虑在一个固定字母表上的所有元胞自动机的集合的两个相对自然的拓扑。第一个结果是相当病态的,因为可数空间既不是第一可数的,也不是连续的。此外,可逆自动机形成一个封闭的集合,而满射自动机是稠密的。第二个拓扑结构,这是由一个度量,更详细地研究。证明了满射自动机集合的合成(在一定的限制下)和逆的连续性以及闭性,并给出了一些反例。然后,我们推广这个空间,在这个意义上,每个移位不变的措施的配置空间诱导一个伪度量的元胞自动机,并研究这些空间的性质。我们还使用Besicovitch距离的伪度量空间的特征,并显示连接到第一(病理)空间。

英文摘要:

We consider two relatively natural topologizations of the set of all cellular automata on a fixed alphabet. The first turns out to be rather pathological, in that the countable space becomes neither first-countable nor sequential. Also, reversible automata form a closed set, while surjective ones are dense. The second topology, which is induced by a metric, is studied in more detail. Continuity of composition (under certain restrictions) and inversion, as well as closedness of the set of surjective automata, are proved, and some counterexamples are given. We then generalize this space, in the sense that every shift-invariant measure on the configuration space induces a pseudometric on cellular automata, and study the properties of these spaces. We also characterize the pseudometric spaces using the Besicovitch distance, and show a connection to the first (pathological) space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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