Timeline for Is every orientable circle bundle principal?
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Oct 6, 2013 at 17:03 | comment | added | Ian Agol | This is essentially true because $Diff^+(S^1)\simeq U(1)$, so $BDiff^+(S^1)\simeq BU(1)$ from the fibration $Diff^+(S^1)/U(1)\to EDiff^+(S^1)/U(1) \to EDiff^+(S^1)/Diff^+(S^1)$ with contractible fibers. | |
| Oct 6, 2013 at 13:55 | vote | accept | user79530 | ||
| Oct 6, 2013 at 13:43 | answer | added | sara | timeline score: 18 | |
| Oct 6, 2013 at 11:36 | review | First posts | |||
| Oct 6, 2013 at 11:37 | |||||
| Oct 6, 2013 at 11:33 | history | edited | user79530 | CC BY-SA 3.0 |
added 202 characters in body; edited title
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| Oct 6, 2013 at 11:16 | history | asked | user79530 | CC BY-SA 3.0 |