Question: Q 3 . [ 2 points ] A useless state in pushdown automaton is never entered on any input string. Consider the problem of determining

3 . [2

points

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A useless state in pushdown automaton is never entered on any input string. Consider the problem of determining whether a pushdown automaton has any useless states. Formulate this problem as a language and show that it is decidable.

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Hint: Use Theorem

4.8 .)

Q 3 . [ 2 points ] A useless state in pushdown

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