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