Timeline for The cardinal of the closure of a set in a topological space
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| S Oct 29, 2020 at 10:05 | history | suggested | Carl-Fredrik Nyberg Brodda | CC BY-SA 4.0 |
Added Hausdorff assumption, by suggestions in the comments.
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| Oct 29, 2020 at 9:59 | review | Suggested edits | |||
| S Oct 29, 2020 at 10:05 | |||||
| Oct 29, 2020 at 9:42 | answer | added | YCor | timeline score: 5 | |
| Oct 29, 2020 at 9:38 | comment | added | Cheski | @YCor. Thanks. If E is also Hausdorff, is the conclusion valid? | |
| Oct 29, 2020 at 9:33 | review | First posts | |||
| Oct 29, 2020 at 9:34 | |||||
| Oct 29, 2020 at 9:32 | comment | added | YCor | Of course you need Hausdorff, otherwise there are trivial examples where the closure of a singleton is arbitrary large. Even T$_1$ is not enough: for an arbitrary set where open subsets are empty or cofinite, the closure of any infinite subset is everything. | |
| Oct 29, 2020 at 9:29 | history | asked | Cheski | CC BY-SA 4.0 |