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