2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103597This paper exhibits a multiplicative and minimal cellular complex which allows explicit and complete (co)homological calculations for the symmetric products of a finite two dimensional CW complex. By considering cohomology, we observe that a classical theorem of Clifford on the dimension of various linear series on a projective curve has a purely topological statement. We give a "real" analog of this theorem for unoriented topological surfaces.14 pagesAlgebraic TopologyAlgebraic Geometry57M20, 55N10text