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  1. 2 Fundamenta Informaticae
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  1. 2 Ostravsky J.
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  1. 1 2001
  2. 1 1998
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Content available remote Prelanguages versus submonoids
Ostravsky J.
Fundamenta Informaticae
|
2001
|
Vol. 46, nr 4
343-348
EN
In [9] submonoids of a commutative monoid are characterized by means of their relations of domination, subgroups of a commutative monoid are characterized by means of their relations of double domination. The main purpose of this paper is to transfer these results to general monoids. The important means will be certain relations, which we shall study in detail.
2
Content available remote Pregrammars versus submonoids
Ostravsky J.
Fundamenta Informaticae
|
1998
|
Vol. 36, nr 4
337-343
EN
Prelanguages and pregrammars introduced present a generalization of languages and pure grammars. Relation of domination and double domination may be easily transferred from languages to prelanguages. In the present paper submonoids of a commutative monoid are characterized by means of their relations of domination: subgroups of a commutative group are characterized by means of their relations of double domination. The submonoid generated by a subset of a commutative monoid is constructed using a suitable pregrammar.
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