proposition: Lemma sube_ge0 x y : (x \is a fin_num) || (y \is a fin_num) -> (0 <= y - x) = (x <= y).
proof: Proof. by move=> /orP[?|?]; [rewrite suber_ge0|rewrite subre_ge0]. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra) signed