Question: 5. Define a binary operation ? (A, B) such that the set of Turing-decidable languages is closed under while the set of Turing-recognisable languages is

5. Define a binary operation ? (A, B) such that the

5. Define a binary operation ? (A, B) such that the set of Turing-decidable languages is closed under while the set of Turing-recognisable languages is not closed under, and prove ihaihas ihis propcriy

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