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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

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