
Can you guide me how to prove this?
Let A1, A2, ,Ak be a collection of languages such that: () Vi, j e 1,… ,k, if j, Ain A,- (ii) UA; Σ* i-1 (ii) Vi E f1,.. ,k, Ai is r.e. Prove that Vi, A, is decidable. Show transcribed image text
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