2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/73067An order-theoretic generalization of Seymour relations describing the connection between the set-theoretic blocker, deletion, and contraction maps on clutters, is presented.6 pages; v.2 corrects a misprint in ReferencesCombinatorics06A06; 90C27text