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A hyperbolic version of the Euclidean Tetrahedron.
See also Hyperbolic Cube, Hyperbolic Dodecahedron, Hyperbolic Octahedron
References
Rivin, I. ``Hyperbolic Polyhedron Graphics.''
http://www.mathsource.com/cgi-bin/MathSource/Applications/Graphics/3D/0201-788.