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Let L = {M: M is a Turing machine that accepts at least two binary strings}. a) De?ne the notions of Turing-recognisable language and undecidable
Let L = {M: M is a Turing machine that accepts at least two binary strings}.
a) De?ne the notions of Turing-recognisable language and undecidable language.
b) Is L Turing-recognisable? Justify your answer with an informal argument.
c) Justify with a formal proof your answer to b). [10 marks] d) Prove that L is undecidable. (Hint: use Rices theorem.)
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