2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/70640This is an expanded version of the talk I gave at Oberwolfach, MIT and several other universities.14 pages, no figures, LaTeX, new section on Duistermaat-Heckman measures addedSymplectic GeometryAlgebraic GeometryOn equivariant cohomology, integrals of equivariant forms and Duistermaat-Heckman measures for non-compact group actionstext