proposition: Lemma dadde_minl : left_distributive (@GRing.add (\bar^d R)) mine.
proof: Proof. by move=> x y z; rewrite !dual_addeE oppe_min adde_maxl oppe_max. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra) signed