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