Discrete Cocompact subgroups of G_53 and related C*-algebras
arXiv:math/0105104
Abstract
The discrete cocompact subgroups of the 5-dimensional Lie group G_53 are determined up to isomorphism. Each of their group C*-algebras is studied by determining all of its simple infinite dimensional quotient C*-algebras. The K-groups and trace invariants of the latter are also obtained.
18 pages