Document Zbl 0315.94051

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J. Math. pur. appl., IX. Sér. 53, 197-222 (1974).

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68Q45	Formal languages and automata
16S10	Associative rings determined by universal properties (free algebras, coproducts, adjunction of inverses, etc.)
93C05	Linear systems in control theory
20M35	Semigroups in automata theory, linguistics, etc.

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