A useless state in a Turing machine is one that is never entered on any input string.
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A useless state in a Turing machine is one that is never entered on any input string. Consider the problem of determining whether a Turing machine has any useless states. Formulate this problem as a language and show that it is undecidable.
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We will reduce halting problem into useless state problem as follows Given input for ...View the full answer
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