Canonical forms of context-free grammars and position restricted grammar forms
This paper deals with the question of canonical forms, or canonical types, for both grammar forms and context-free grammars. Certain canonical types are position restricted if they depend only upon the positions of terminals and nonterminals. We show that with a few very minor restrictions every possible production-type may be specified as a canonical type for arbitrary context free grammars. The result does not hold for grammar forms where a certain restriction must be made.
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