2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/71122Let R be a local ring and A a connected differential graded algebra over R which is free as a graded R-module. Using homological perturbation theory techniques, we construct a minimal free multi model for A having properties similar to that of an ordinary minimal model over a field; in particular the model is unique up to isomorphism of multialgebras. The attribute multi refers to the category of multicomplexes.AMSTeX2.1, 21 pagesAlgebraic Topology18G10 18G35 18G55 55P35 55P62 55U15 57T30text