Slightly commutative Kleene semigroups

[摘要] Commutative Kleene semigroups are known to be rational, but Pelletier constructed a nonrational weakly commutative Kleene semigroup. We introduce slightly commutative Kleene semigroups, a class of weakly commutative Kleene semigroups, and prove that every slightly commutative Kleene semigroup is rational. (C) 1997 Academic Press.

[发布日期] 1997-06-01