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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Introduction to the theory of computation

ISBN: 978-0470530658

3rd edition

Authors: Michael Sipser

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Question Posted: Sep 02, 2020 04:48 AM

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A useless state in a Turing machine is one that is never entered on any input string.

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We will reduce halting problem into useless state problem as follows Given input for ...View the full answer

Introduction to the theory of computation

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