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Which of the following parameters cannot be used to restrict a turing machine?

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Which of the following parameters cannot be used to restrict a turing machine?

(a) tape alphabets

(b) number of tapes

(c) number of states

(d) none of these

This question was posed to me in exam.

This key question is from Multistack Machines, Counter Machines topic in portion Introduction to Turing Machines of Automata Theory

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Right choice is (d) none of these

For explanation: Another procedure to restrict a turing machine is to limit the size of tape alphabet or reduce the number of states. If the tape alphabets, number of tapes or number of states are limited, then there is only a finite number of different turing machine, so the restricted model is more powerful than the original one.

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