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Advanced Calculus: Difference between revisions
→Closed
(→Closed) |
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* (Topology) | * (Topology) | ||
; Notes | |||
* Union of infinitely many closed sets can be open. | |||
* Intersection of infinitely many open sets can be closed. | |||
* <math>\{\}</math and <math>\mathbb{R}</math> are both open and closed | |||
===Compact=== | ===Compact=== | ||
Compactness is a generalization of closed and bounded.<br> | Compactness is a generalization of closed and bounded.<br> | ||