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Recall that an instance of the halting problem is a string of the form x; y and the goal is to decide if the Turing
Recall that an instance of the halting problem is a string of the form x; y and the goal is to decide if the Turing machine M_x encoded by the string x halts on input y. If M_x halts on y, then x; y is a YES instance. Otherwise, x; y is a NO instance. Let us say that a Turing machine M fails to solve the halting problem for instance x; y if it never terminates or if it produces the wrong answer, i e., it rejects in case that x; y is a YES instance or it accepts in case that x; y is a NO instance. Because the halting problem is undecidable, we know that for every Turing machine M there exists an instance x; y of the halting problem such that M fails to solve x; y. Describe an algorithm to find such an instance. The input to your algorithm i a description of a Turing s machine M. For every such input, your algorithm should run for a finite number of steps and output a halting problem instance x; y such that M fails to solve x; y
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