Abstract
The closure of a regular language under commutation or partial commutation has been extensively studied [1,11,12,13], notably in connection with regular model checking [2,3,7] or in the study of Mazurkiewicz traces, one of the models of parallelism [14,15,16,22]. We refer the reader to the survey [10,9] or to the recent articles of Ochmański [17,18,19] for further references.KeywordsFree ProductRegular LanguageGroup LanguagePositive VarietyMinimal IdealThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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