Question: A = { M : M is a TM , and there exists a string x such that M halts on input x } .

A ={M : M is a TM, and there exists a string x such that M halts on input x}.
Prove that A is undecidable. (Hint: The relationship between EMP T YTM and
ACCTM is similar to the relationship between A and complement-
HALTTM.)

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