Lower algebraic -theory of hyperbolic 3-simplex reflection groups

  • Jean-François Lafont

    S.U.N.Y. Binghamton, USA
  • Ivonne J. Ortiz

    Miami University, Oxford, United States


A hyperbolic 3-simplex reflection group is a Coxeter group arising as a lattice in , with fundamental domain a geodesic simplex in (possibly with some ideal vertices). The classification of these groups is known, and there are exactly 9 cocompact examples, and 23 non-cocompact examples. We provide a complete computation of the lower algebraic -theory of the integral group ring of all the hyperbolic 3-simplex reflection groups.

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Cite this article

Jean-François Lafont, Ivonne J. Ortiz, Lower algebraic -theory of hyperbolic 3-simplex reflection groups. Comment. Math. Helv. 84 (2009), no. 2, pp. 297–337

DOI 10.4171/CMH/163