> < ^ Date: Tue, 10 Aug 1993 16:55:13 +0200
> < ^ From: Toni Greil <greil@guug.de >
< ^ Subject: Re: SL_2

Dear Gap Forum--I was hoping to do some investigations concerning
SL_2 and PSL_2 of the ring of integers in Q(sqrt(p)). These groups are
finitely presented (I believe) but I haven't been able to find an explicit
presentation in the literature. Specific examples (e.g. p=5) would be of
interest as well as the general case.

Thank you,
Daniel Ruberman

One reference is:

Benjamin Fine,
"Algebraic Theory of the Bianchi Groups"
- Monographs and textbooks in pure and applied mathematics; 129 -
Marcel Dekker, Inc. New York and Basel (1989)

Toni Greil, Muenchen (Germany)

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