On Mon, Apr 7, 2014 at 11:36 AM, Oren Becker <[email protected]> wrote:
> I would like to compute the spectrum of a certain Cayley graph on PGL(2,q), 
> for a certain prime power q.
>
> I created the generators of the graph as elements of GL(2,q).
>

Why don't you redo your steps but change this step to use PGL instead of GL?

> Now, how do I get the spectrum of the Cayley graph on PGL(2,q)? I thought to 
> first create the Cayley graph using PGL.cayley_graph(), and then take the 
> spectrum. But, taking a quotient is not implemented on GL(2,q), so I can't 
> even move from GL to PGL.
>
> Of course, I can work hard to create the adjacency matrix, then take the 
> spectrum, but I'm hoping for an easier solution.
>
> (I am new to Sage).
>
> Thanks,
> Oren.
>
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