CDMTCS Research Report Series On Coloring the Rational Quantum Sphere Hans Havlicek Institut f¨ ur Geometrie, Technische Universit¨at Wien, Austria G¨ unther Krenn Johann Summhammer Atominstitut der ¨ Osterreichishen Universit¨ aten, Austria Karl Svozil Theoretische Physik, Technische Universit¨ at Wien, Viena Austria CDMTCS-121 February 2000 Centre for Discrete Mathematics and Theoretical Computer Science