Formal languages
Fundamenta Informaticae - Special issue on grammar systems
Fundamenta Informaticae
Formal Grammars and Languages
Automata, Languages, and Machines
Automata, Languages, and Machines
Formal languages and their relation to automata
Formal languages and their relation to automata
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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.