proposition: Lemma ltr_nnorml v x : x <= 0 -> `|v| < x = false.
proof: Proof. by move=> h; rewrite le_gtF //; apply/(le_trans h). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)