2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223135In this paper we study the homology and cohomology of confguration spaces of two distinct particles on a graph. Our main tool is intersection theory for cycles in graphs. We obtain an explicit description of the cohomology algebra of the configuration space in the case of planar graphs.31 pages, 15 figuresAlgebraic TopologyCombinatorics55R80; 57M15.text