2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/221519We give a detailed proof that, for any natural number n, each algebraic two complex over C_n \times C_\infty is realised up to congruence by a geometric complex arising from a presentation for the group.This is the version published by Algebraic & Geometric Topology on 24 February 2006Algebraic Topology16D70, 55P15, 57M20, 55Q05text