1
Aug 9 '13 at 8:04
1
Why does $PSL(2,\mathbb C)\cong PGL(2,\mathbb C)$ but $PSL(2,\mathbb R) \not\cong PGL(2,\mathbb R)$?
Mar 19 '12 at 9:43
0
Oct 31 '13 at 10:15
0
Nov 28 '13 at 11:32
0
Oct 11 '13 at 10:01