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