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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

Freitag

--

Prof David Joyner, Mathematics Department

U. S. Naval Academy, Annapolis, MD 21402

phone: (410) 293-6738

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