Keywords. Regge symmetry, hyperbolic tetrahedron, scissors congruence
AMS subject classification. Primary: 51M10. Secondary: 51M20.
Submitted: 8 October 2002. (Revised: 22 December 2002.) Accepted: 10 January 2003. Published: 24 January 2002.
Department of Mathematics, University of California at San Diego
La Jolla, CA 92093-0112, USA
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