Question: Let C be a language. Prove that C is Turing-recognizable iff a decidable language D exists such that C = {x| y (x, y

Let C be a language. Prove that C is Turing-recognizable iff a decidable language D exists such that C = {x| ∃y (〈x, y〉 ∈ D)}.

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To prove that a language C is Turingrecognizable if and only if there exists a decidable language D such that C x exists y langle x y angle in D well ... View full answer

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