Slightly Commutative Kleene Semigroups
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C.P. Rupert
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Article
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1997
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Elsevier Science
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English
β 285 KB
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 rat