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>> No.12788343 [View]
File: 13 KB, 474x234, Rudin_2_7_wtf.png [View same] [iqdb] [saucenao] [google]
12788343

Quick question about Rudin question 2.7. A solution/statement is here (Theorem 2.27 is the Heine Borel Theorem):
https://math.stackexchange.com/questions/3448459/rudin-exercise-2-7-union-of-subsets-of-a-metric-space-and-closure-thereof

See pic related. How does the infinite union follow?

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