Question: Let = {a, b}. Give a DFA/RE, CFG/PDA, a Turing machine for the language {a^nb^n|n 0}, if it exists. If it does not exist, prove

Let = {a, b}. Give a DFA/RE, CFG/PDA, a Turing machine for the language {a^nb^n|n 0}, if it exists. If it does not exist, prove in detail why it does not exist.

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