Let X be a set with at least two elements, and let a X. Prove or disprove:(a) If (X, d)
Chapter 16, Problem 16.29(choose chapter or problem)
Let X be a set with at least two elements, and let a X. Prove or disprove:(a) If (X, d) is a metric space, then X {a} is an open set.(b) If (X, d) is a topological space, then X {a} is an open set.
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