> < ^ Date: Tue, 26 Feb 2002 09:28:08 +0000
> < ^ From: David Joyner <wdj@usna.edu >
> < ^ Subject: Re: Metaplektische Gruppe

Dear GAP-forum:

freitag wrote:
> Dear GAP-forum,
> the group SL(2) over the ring Z/qZ (for example q=12 is interesting)
> admits a twofold covering, the mataplectic group.
> What is the best way to get it into GAP?

If memory serves, when q is prime a thrm of Steinberg implies that such
a covering splits. GAP's DirectProduct command will then do the trick.
Do you know how to define the cocycle on SL(2,Z/qZ) when q is not
a prime? - David Joyner


Prof David Joyner, Mathematics Department
U. S. Naval Academy, Annapolis, MD 21402
phone: (410) 293-6738

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