Advanced Calculus: Difference between revisions

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* Union of infinitely many closed sets can be open.
* Union of infinitely many closed sets can be open.
* Intersection of infinitely many open sets can be closed.
* Intersection of infinitely many open sets can be closed.
* <math>\{\}</math and <math>\mathbb{R}</math> are both open and closed
* <math>\{\}</math> and <math>\mathbb{R}</math> are both open and closed


===Compact===
===Compact===