Question: 1 5 . 6 An Always - Left State If a Turing machine M has a state z such that for every letter a in

15.6 An Always-Left State
If a Turing machine M has a state z such that for every letter a in \Gamma , there exists a letter b in \Gamma such that \delta (z, a)=(z, b, L), then M does not halt on any input.

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