Prove or disprove: Let (X, d) be a metric space. For every open set O in X such thatO =
Chapter 16, Problem 16.31(choose chapter or problem)
Prove or disprove: Let (X, d) be a metric space. For every open set O in X such thatO = , there exist b O and an open sphere Sr(b) in X such that Sr(b) and O are disjoint.
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