proposition: Lemma real_ltrNnormlW x y : x \is real -> `|x| < y -> - y < x.
proof: Proof. by move=> ?; case/real_ltr_normlP => //; rewrite ltrNl. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)