Construct a word-chain automaton that is able to recognize the string $a^nb^n$ for all $n \in \mathbb{N}$. Find a string that your automaton recognizes that is not of the form $a^nb^n$. (Such a string must exist, by Theorem 6.3.) aabb a abab ab aba
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This means that the automaton should accept any string that starts with one or more 'a's followed by a single 'b'. Show more…
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