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arXiv 2007.10273cs.FLmath.GR
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关于自动机半群和群的轨道

On the Orbits of Automaton Semigroups and Groups

Daniele D'Angeli, Dominik Francoeur, Emanuele Rodaro, Jan Philipp Wächter

摘要:

我们研究了自动机半群和群的轨道,得到了一般自动机和一些特殊子类的算法和结构结果。首先,我们证明了自动机群的有限性问题的一个更一般的版本是不可判定的。这个问题等价于由完全可逆自动机生成的自动机半群中左主理想的有限性问题。然后,我们看一下具有有限轨道的$ω$ -字(即右无限字)。我们表明,每一个自动机产生一个$ω$字与有限的轨道已经产生一个最终的周期,这是不是周期性的一般,但是。在算法方面,我们观察到,这是不可能的,以决定是否一个给定的周期$ω$ -字有一个无限的轨道,我们不能检查是否一个给定的可逆和完全自动机承认一个$ω$ -字与有限的轨道,可逆的情况下自动机半群的有限性问题的倒数问题。最后,我们研究了由可逆但非双可逆自动机生成的自动机群,并证明了许多词在这种自动机的作用下具有无限轨道。

英文摘要:

We investigate the orbits of automaton semigroups and groups to obtain algorithmic and structural results, both for general automata but also for some special subclasses. First, we show that a more general version of the finiteness problem for automaton groups is undecidable. This problem is equivalent to the finiteness problem for left principal ideals in automaton semigroups generated by complete and reversible automata. Then, we look at $ω$-word (i.e. right infinite words) with a finite orbit. We show that every automaton yielding an $ω$-word with a finite orbit already yields an ultimately periodic one, which is not periodic in general, however. On the algorithmic side, we observe that it is not possible to decide whether a given periodic $ω$-word has an infinite orbit and that we cannot check whether a given reversible and complete automaton admits an $ω$-word with a finite orbit, a reciprocal problem to the finiteness problem for automaton semigroups in the reversible case. Finally, we look at automaton groups generated by reversible but not bi-reversible automata and show that many words have infinite orbits under the action of such automata.

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