2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/140316Using methods applied by Atiyah in equivariant K-theory, Bredon obtained exact sequences for the relative cohomologies (with rational coefficients) of the equivariant skeletons of (sufficiently nice) T-spaces, T=(S^1)^n, with free equivariant cohomology over the cohomology of BT. Here we characterise those finite T-CW complexes with connected isotropy groups for which an analogous result holds with integral coefficients.similar main result as in our preprint math.AT/0307112, but the proof is more elementary; 10 pages; final versionAlgebraic Topology55N91 (primary), 53D20 (secondary)text