In 1999, Fuchs and Schweigert proposed formulas of Verlinde type for moduli
spaces of surface group representations in compact nonsimply connected Lie
groups. In this paper, we will prove a symplectic version of their conjecture
for surfaces with at most one boundary component. A key tool in our
computations is Kostant's notion of a maximal torus in apposition.Comment: 30 pages, to appear in Kostant Memorial Volume, Progress in
  Mathematics (Birkhauser