Kambites, Mark
(2006)
*Word problems recognisable by deterministic blind monoid automata.*
Theoretical Computer Science, 362 (1-3).
pp. 232-237.
ISSN 0304-3975

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## Abstract

We consider blind, deterministic, finite automata equipped with a register which stores an element of a given monoid, and which is modified by right multiplication by monoid elements. We show that, for monoids M drawn from a large class including groups, such an automaton accepts the word problem of a group H if and only if H has a finite index subgroup which embeds in the group of units of M. In the case that M is a group, this answers a question of Elston and Ostheimer.

Item Type: | Article |
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Uncontrolled Keywords: | Group; Monoid; Automaton; Word problem; Finite index subgroup |

Subjects: | MSC 2010, the AMS's Mathematics Subject Classification > 18 Category theory; homological algebra |

Depositing User: | Ms Lucy van Russelt |

Date Deposited: | 27 Mar 2007 |

Last Modified: | 20 Oct 2017 14:12 |

URI: | http://eprints.maths.manchester.ac.uk/id/eprint/726 |

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