Question: 3. Prove that a language A CS* is semi-decidable if and only if there is a decidable binary relation R * x * such that

3. Prove that a language A CS* is semi-decidable if and only if there is a decidable binary relation R * x * such that for all r *, A if and only if there is some * for which (z,y) ER A binary relation R is decidable if there is a Turing machine M where if a pair (r,y) 5*x * is given as input, then M determines whether or not (2,y) E R in finite time

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