On the Complexity of the Word Problem of Automaton Semigroups and Automaton Groups

نویسندگان

  • Daniele D'Angeli
  • Emanuele Rodaro
  • Jan Philipp Wächter
چکیده

In this paper, we study the word problem of automaton semigroups and automaton groups from a complexity point of view. As an intermediate concept between automaton semigroups and automaton groups, we introduce automaton-inverse semigroups, which are generated by partial, yet invertible automata. We show that there is an automaton-inverse semigroup and, thus, an automaton semigroup with a PSpace-complete word problem. We also show that there is an automaton group whose word problem with a single rational constraint is PSpace-complete. Additionally, we provide simpler constructions for the uniform word problems of these classes. For the uniform word problem for automaton groups (without rational constraints), we show NL-hardness. Finally, we investigate a question asked by Cain about a better upper bound for the length of a word on which two distinct elements of an automaton semigroup must act differently.

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عنوان ژورنال:
  • CoRR

دوره abs/1611.09541  شماره 

صفحات  -

تاریخ انتشار 2016