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Automates et commutations partielles. (Automata and partial commutations). (French) Zbl 0601.68055
We consider words over an alphabet equipped with a partial commutation rule. The main result of the paper gives a sufficient condition for a set of words closed under the commutation rule to be recognizable by a finite automaton. More precisely, if X is recognizable and if ab\(\sim ba\) implies that the letters a and b do not appear in the same word of X, then the closure of \(X^*\) under the commutation rule is recognizable.

68Q45 Formal languages and automata
20M05 Free semigroups, generators and relations, word problems
20M35 Semigroups in automata theory, linguistics, etc.
Full Text: EuDML
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