Glad I'm not the only one ... ---------- Forwarded message ---------- From: jean gallier <jean@cis.upenn.edu> Date: Jan 13, 2008 7:41 PM Subject: Re: PSL(2, C) versus SO_0(1,3) To: Fred lunnon <fred.lunnon@gmail.com>, Eugene Salamin <gene_salamin@yahoo.com> Dear Fred I said something wrong in my previous message. Dan is right, PSL(2, C) is indeed isomorphic to SO(1, 3)/{-I, I}, since SO(1, 3) has two connected components, one of which is SO_0(1, 3) (also denoted SO^+(1, 3)), the connected component of the identity. My email address has changed two years ago, this is probably why my message bounced. By the way, you can call me "jean" is you wish! Best, -- Jean Gallier On Jan 13, 2008, at 12:58 PM, Fred lunnon wrote:
On 1/13/08, Fred lunnon <fred.lunnon@gmail.com> wrote:
Dear M. Gallier, I have forwarded your message to the math-fun list. WFL ...
The URL
http://www.cis.upenn.edu/~jean/gbooks/manif.html.
needs the final (accidental) full stop "." deleted to avoid error 404. WFL