Prove that x is not decidable
Let X = { | M is a single-tape TM that never modifies the portion of the tape that contains the input w}.Prove that X is not decidable. Hint: you may find it easier to work with the complement of X.
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Let X = {<M, w> | M is a single-tape TM that never modifies the portion of the tape that contains the input w}.
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