2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61458The 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 pagesOperator Algebras22E40, 46L35, 46L80, 46L55text