From: Pat Ballew (for Teacher2Teacher Service)
Date: Jun 24, 2000 at 12:18:31
Subject: Re: Non-Euclidean Geometry

I think this usually follows as a consequence of Lobachevskii's formula, but
it has been so long since I did anything rigorous in this area, I would be
remiss in doing more than giving a couple of resources:
  here is a collection of web sites at the math forum all related to
hyperbolic geometry... hope they help...
http://forum.swarthmore.edu/library/topics/hyperbolic_g/branch.html

good luck

 -Pat Ballew, for the Teacher2Teacher service

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