proposition: Lemma ltrNnormlW x y : `|x| < y -> - y < x.
proof: Proof. exact: real_ltrNnormlW. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)