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Problem
#113154

Automata and Computability

Let C be a language.  Prove that C turing-recognizable if a decidable language D exists such that C = {x | y (x,y  D)}.

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Problem 17

Let C be a language. Prove that C turing-recognizable if a decidable
language D exists such that C = {x | (y ((x,y( ( D)}.
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