The loop problem for monoids and semigroups

Details The loop problem for monoids and semigroups The loop problem for monoids and semigroups

2006-09-11

arxiv.org/abs/math/0609293v1

Mathematics

Rings and Algebras

21 pages

Scientific paper

We propose a way of associating to each finitely generated monoid or semigroup a formal language, called its loop problem. In the case of a group, the loop problem is essentially the same as the word problem in the sense of combinatorial group theory. Like the word problem for groups, the loop problem is regular if and only if the monoid is finite. We study also the case in which the loop problem is context-free, showing that a celebrated group-theoretic result of Muller and Schupp extends to describe completely simple semigroups with context-free loop problems. We consider also right cancellative monoids, establishing connections between the loop problem and the structural theory of these semigroups by showing that the syntactic monoid of the loop problem is the inverse hull of the monoid.

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