Timeline for When can a finite subgroup of $GL(2n,\mathbb{R})$ be viewed as a subgroup of $GL(n,\mathbb{C})$?
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 9, 2016 at 15:37 | comment | added | benblumsmith | +1 This whole discussion is just what I needed. | |
| Jul 9, 2016 at 9:30 | comment | added | Qiaochu Yuan | @Derek: you're right. So in fact it's unnecessary to know anything about the irreducibles over $\mathbb{R}$. | |
| Jul 9, 2016 at 8:28 | comment | added | Derek Holt | So isn't the simple answer that you calculate its (complex) character, decompose it into irreducibles, and check whether it is the sum of pairs of conjugate characters? | |
| Jul 9, 2016 at 7:07 | vote | accept | benblumsmith | ||
| Jul 9, 2016 at 1:21 | history | answered | Qiaochu Yuan | CC BY-SA 3.0 |