2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143225We compute the integral cohomology rings of a family of 3-groups. As a corollary, we exhibit, for each n greater than or equal to 5, a pair of groups of order 3^n whose integral cohomology rings are isomorphic.Algebraic Topology20J063-groups are not determined by their integral cohomology ringstext