2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74914We show that, for an arrangement of subspaces in a complex vector space with geometric intersection lattice, the complement of the arrangement is formal. We prove that the Morgan rational model for such an arrangement complement is formal as a differential graded algebra.10 pages, 1 figureAlgebraic TopologyCombinatoricsprimary 52C35; secondary 05E25, 55P62Formality of the complements of subspace arrangements with geometric latticestext