Timeline for Contractible set in a manifold
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 25, 2021 at 1:55 | vote | accept | Zhiqiang | ||
| Jul 16, 2021 at 16:03 | answer | added | Shijie Gu | timeline score: 0 | |
| Jul 14, 2021 at 1:31 | comment | added | skupers | A technique worth looking at is "engulfing". | |
| Jul 13, 2021 at 22:57 | history | became hot network question | |||
| Jul 13, 2021 at 18:14 | comment | added | Ryan Budney | If you want conditions that would allow you to make your conclusion, take a look at Larry Siebenmann's Ph.D thesis. | |
| Jul 13, 2021 at 15:25 | answer | added | Tom Goodwillie | timeline score: 8 | |
| Jul 13, 2021 at 15:21 | comment | added | Nicolast | Take $K$ to be one side (homeomorphic to a ball) of Alexander's horned sphere. Then small open neighbourhoods of $K$ are not homeomorphic to $\mathbb R^3$ since their complement is not simply connected. But of course you could take a large neighbourhood of $K$ which is an open ball. I suspect that you can creat an actual counter-example by adding some topology in the complement of $K$. | |
| Jul 13, 2021 at 15:20 | answer | added | Danny Ruberman | timeline score: 9 | |
| Jul 13, 2021 at 14:56 | history | asked | Zhiqiang | CC BY-SA 4.0 |