The intersection of free submonoids of a free monoid is free.
B. Tilson (1972)
Semigroup forum
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B. Tilson (1972)
Semigroup forum
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C.M. Reis (1978)
Semigroup forum
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Y. Kobayashi (1992)
Semigroup forum
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H.J. SHYR (1975)
Semigroup forum
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J. van Leeuwen (1975)
Semigroup forum
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S. Margolis, C.J. Meakin (1992)
Semigroup forum
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Pedro V. Silva (2012)
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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The fixed point submonoid of an endomorphism of a free product of a free monoid and cyclic groups is proved to be rational using automata-theoretic techniques. Maslakova’s result on the computability of the fixed point subgroup of a free group automorphism is generalized to endomorphisms of free products of a free monoid and a free group which are automorphisms of the maximal subgroup.
Pedro V. Silva (2012)
RAIRO - Theoretical Informatics and Applications
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The fixed point submonoid of an endomorphism of a free product of a free monoid and cyclic groups is proved to be rational using automata-theoretic techniques. Maslakova’s result on the computability of the fixed point subgroup of a free group automorphism is generalized to endomorphisms of free products of a free monoid and a free group which are automorphisms of the maximal subgroup.
T. Evans (1972)
Semigroup forum
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Y. Kobayashi, T. Saito, T. Iwamoto, K. Kajitori (1991)
Semigroup forum
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Ferrán Cedó Gine (1989)
Publicacions Matemàtiques
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We give a new condition on a monoid M for the monoid ring F[M] to be a 2-fir. Furthermore, we construct a monoid that satisfies all the currently known necessary conditions for F[] to be a semifir and that the group of units of is trivial, but is not a directed union of free monoids.
Robert J. Weaver (1972)
Colloquium Mathematicae
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