proposition: Fact meetUl : left_distributive meet join.
proof: Proof. by move=> *; rewrite !meetE !joinE meetUl. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)