proposition: Lemma lte_daddl y x : y \is a fin_num -> (y < y + x) = (0 < x).
proof: Proof. by rewrite -fin_numN dual_addeE lteNr; exact: gte_subl. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra) signed