2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/70441A Rayleigh matroid is one which satisfies a set of inequalities analogous to the Rayleigh monotonicity property of linear resistive electrical networks. We show that every matroid of rank three satisfies these inequalities.11 pages, 3 figures, 3 tablesCombinatorics05B35; 60C05text