
Two strategies of parallel adjoining of contexts are considered for contextual grammars with choice. After a short comparison between them, there are provided Chomsky-Schutzenberger type characterizations of context-free and recursively enumerable languages. Finally, we discuss some decision problems.
Grammars and rewriting systems, parallel adjoining of contexts, contextual grammars, Formal languages and automata
Grammars and rewriting systems, parallel adjoining of contexts, contextual grammars, Formal languages and automata
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