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S May 20, 2016 at 15:44 history bounty ended Sebastian Goette
S May 20, 2016 at 15:44 history notice removed Sebastian Goette
May 19, 2016 at 18:31 history edited Qfwfq CC BY-SA 3.0
added 3 characters in body
May 19, 2016 at 16:59 answer added Bo Liu timeline score: 9
S May 12, 2016 at 16:14 history bounty started Sebastian Goette
S May 12, 2016 at 16:14 history notice added Sebastian Goette Draw attention
Mar 9, 2016 at 20:09 history edited Sebastian Goette CC BY-SA 3.0
See Ali's comment
Mar 9, 2016 at 19:00 comment added Sebastian Goette @AliTaghavi I am not entirely sure. But maybe it does not have to be a subgroup to be a valid classifying space. I think you get a subgroup if you demand that $1$ is the only essential eigenvalue.
Mar 9, 2016 at 18:41 comment added Ali Taghavi Is it obvious that $\mathcal U _{0}$ is a subgroup?
Mar 9, 2016 at 17:25 history asked Sebastian Goette CC BY-SA 3.0