Timeline for Can a subset of the plane have nontrivial $H_2$ or $\pi_2$?
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 14, 2018 at 16:29 | comment | added | j.c. | The link to the preprint cited by Igor Belegradek is now here preprinti.imfm.si/PDF/00863.pdf | |
| Dec 9, 2014 at 22:47 | vote | accept | Timothy Chow | ||
| Dec 9, 2014 at 22:20 | answer | added | Ian Agol | timeline score: 42 | |
| Dec 9, 2014 at 21:57 | comment | added | Igor Belegradek | Read the introduction in imfm.si/preprinti/PDF/00863.pdf. | |
| Dec 9, 2014 at 21:33 | comment | added | Fernando Muro | I assume you're looking for pathological examples. By Alexander duality, $H_2$ must be trivial if the subset is compact and locally contractible. | |
| Dec 9, 2014 at 21:32 | answer | added | Jeff Strom | timeline score: 69 | |
| Dec 9, 2014 at 21:13 | history | asked | Timothy Chow | CC BY-SA 3.0 |