2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/133059We give a positive equivariant Littlewood-Richardson rule also discovered independently by Molev. Our proof generalizes a proof by Stembridge of the ordinary Littlewood-Richardson rule. We describe a weight-preserving bijection between our indexing tableaux and the Knutson-Tao puzzles.27 pages; notation simplified in Section 2; other minor stylistic changes; references addedAlgebraic GeometryCombinatorics14M15; 05E10text