2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/78663Jeffrey and Kirwan suggested expressions for intersection pairings on the reduced space of a Hamiltonian G-space in terms of multiple residues. In this paper we prove a residue formula for symplectic volumes of reduced spaces of a quasi-Hamiltonian SU(2)-space. The definition of quasi-Hamiltonian G-spaces was recently introduced by Alekseev, Malkin and Meinrenken.8 pages, AMSLaTeXDifferential Geometrytext