Here we show that the A_NFA language is decidable. Note that this language has all pairs M, w where M is an NFA and w is a string such that M accepts w. We cannot just simulate M on w since there are choices. We then convert M into an equivalent DFA, and ask the decider for A_DFA the same question.
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Негізгі бет Acceptance for NFAs is Decidable (to convert or to not convert? That's the question!)
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