Lecture 11 Context-Free Grammar. Definition. A context-free grammar (CFG) G is a quadruple (V, Σ , R, S) where V : a set of non-terminal symbols Σ : a set of terminals ( V ∩ Σ = Ǿ ) R : a set of rules ( R: V → (V U Σ )* ) S : a start symbol. Example. V = {q, f,} Σ = {0, 1}

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