Question: 21. (15 points). For Turning Machine M let Lf(M) be the language accepted by M by halting in a final state. Let (a) Define what

21. (15 points). For Turning Machine M let Lf(M) be the language accepted by M by halting in a final state. Let (a) Define what it means for a language to be recursively enumerable. (b) Prove that Lu is recursively enumerable. (c) Prove that L is not recursively enumerable

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