2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/140388Let T be a torus. We show that Koszul duality can be used to compute the equivariant cohomology of topological T-spaces as well as the cohomology of pull backs of the universal T-bundle. The new features are that no further assumptions about the spaces are made and that the coefficient ring may be arbitrary. This gives in particular a Cartan-type model for the equivariant cohomology of a T-space with arbitrary coefficients. Our method works for intersection homology as well.37 pages; to appear in Int. Math. Res. NotAlgebraic Topology16S37, 55N91; 55N10, 55N33, 55U15text