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arXiv math/0608240math.DS
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元胞自动机周期点、不变测度和几乎等度连续点的稠密性

Density of periodic points, invariant measures and almost equicontinuous points of cellular automata

Pierre Tisseur

摘要:

重新讨论了R. Gilman的结果,证明了一个移位遍历测度m的象测度序列通过m-几乎等度连续自动机F的迭代,按Cesaro平均收敛到一个不变测度mc.如果初始测度m是Bernouilli测度,我们证明了Cesaro平均极限测度mc是移位混合的.因此,我们还证明了对任意的移位遍历和F-不变测度m,m-几乎等度连续点的存在性意味着周期点的集合在不变测度m的拓扑支撑S(m)中是稠密的.最后给出了一个在S(m)中没有等度连续点的偶(m-等度连续元胞自动机F,移位遍历和F-不变测度m)的非平凡例子.

英文摘要:

Revisiting the notion of m-almost equicontinuous cellular automata introduced by R. Gilman, we show that the sequence of image measures of a shift ergodic measure m by iterations of a m-almost equicontinuous automata F, converges in Cesaro mean to an invariant measure mc. If the initial measure m is a Bernouilli measure, we prove that the Cesaro mean limit measure mc is shift mixing. Therefore we also show that for any shift ergodic and F-invariant measure m, the existence of m-almost equicontinuous points implies that the set of periodic points is dense in the topological support S(m) of the invariant measure m. Finally we give a non trivial example of a couple (m-equicontinuous cellular automata F, shift ergodic and F-invariant measure m) which has no equicontinuous point in S(m).

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