Question: Recognizable and unrecognizable languages (a) (Complement of ALLCFG) Let ALLCFG = {(G) | G is a CFG with terminal set and L(G) = *}.

Recognizable and unrecognizable languages

(a) (Complement of ALLCFG) Let ALLCFG = {(G) | G is a CFG with terminal set ∑ and L(G) = ∑*}. Prove that the complement of ALLCFG is Turing-recognizable.

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