Department of Mathematics


  •  Igor Dolgachev, University of Michigan
  •  The reflection group of a regular tetrahedron
  •  09/27/2018
  •  4:10 PM - 5:00 PM
  •  C304 Wells Hall

I will explain how the group of affine orthogonal transformations generated by the reflections into the four facets of a regular tetrahedron and its symmetries appears as a discrete group of motions of the 9-dimensional hyperbolic space, as the full group of automorphisms of some algebraic surfaces and as a lattice in a projective linear group over the 3-adic numbers.



Department of Mathematics
Michigan State University
619 Red Cedar Road
C212 Wells Hall
East Lansing, MI 48824

Phone: (517) 353-0844
Fax: (517) 432-1562

College of Natural Science