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OpenStudy (anonymous):
Let Q be the set of rational numbers in (0,1) and ε > 0. (a) Describe an open set V containing Q, such that m(V \Q) < ε. (b) Describe a closed set F, F ⊂ I, I := (0,1)\Q, such that m(I \F) < ε. where m(·) is the Lebesgue measure.
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