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Questions about which problems are semi-decidable, also known as computably enumerable, Turing recognizable or recursively enumerable.

2 votes
2 answers
984 views

Showing that the language L={⟨M,w⟩ | M moves its head in every step while computing w} is de...

How would you go about showing that the language L={⟨M,w⟩ | M moves its head in every step while computing w} is decidable or undecidable? Intuitively speaking I think it is indeed undecidable because …
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