Problem Set 2: Solutions Math 201A Fall 2016 Problem 1 ...
(b) Let AˆQ be any subset of the rational numbers with at least two elements. Choose x;y2Awith x6= y. The irrational numbers are dense in R, so there exists z2RnQ such that x<z<y. Let U= (1 ;z) \A; V = (z;1) \A: Then U, V are open sets in the relative topology on A. Moreover, x2U, y2V so U, V are nonempty, and U\V = ;, U[V = A. It
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