On semidirect and two-sided semidirect products of finite trivial monoids
F. Blanchet-Sadri (1996)
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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Displaying similar documents to “Relational morphisms and operations on recognizable sets”
On semidirect and two-sided semidirect products of finite trivial monoids
On the semidirect product of the pseudovariety of semilattices by a locally finite pseudovariety of groups
F. Blanchet-Sadri (1997)
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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Schützenberger-like products in non-free monoids
Roman R. Redziejowski (1995)
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Roman König (1985)
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Johannes Arz (1983)
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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On expressing commutativity by finite Church-Rosser presentations : a note on commutative monoids
Jürgen Avenhaus, Ronald V. Book, Craig C. Squier (1984)
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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A conjecture on the concatenation product
Jean-Eric Pin, Pascal Weil (2001)
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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In a previous paper, the authors studied the polynomial closure of a variety of languages and gave an algebraic counterpart, in terms of Mal’cev products, of this operation. They also formulated a conjecture about the algebraic counterpart of the boolean closure of the polynomial closure – this operation corresponds to passing to the upper level in any concatenation hierarchy. Although this conjecture is probably true in some particular cases, we give a counterexample in the general...