Question: Show that the set A = {x | (x) is defined for at least one input} is r.e. but not recursive. P 97 Ex 4

Show that the set A = {x | (x) is defined for at least one input} is r.e. but not recursive. P 97 Ex 4 : Computability,Complexity, and Languages by Davis, Sigal, Weyuke

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