Question: Q4 [10 marks] Let {Anin e N} be a collection of c.e. sets. Is Un An C. e.? Under which condition can this be true?

Q4 [10 marks] Let {Anin e N} be a collection of

Q4 [10 marks] Let {Anin e N} be a collection of c.e. sets. Is Un An C. e.? Under which condition can this be true? Briefly write your thoughts

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