
doi: 10.3233/fi-1985-8106
In the paper we define the notions of the best lower and the best upper approximations of grammar, which are based on the concept of rough set introduced by Pawlak in [4]. Furthermore we give the properties of languages generated by the best lower and the best upper approximations of grammar.
rough set, rough languages, Formal languages and automata, approximations of grammars
rough set, rough languages, Formal languages and automata, approximations of grammars
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