proposition: Lemma normr_lt0 v : `|v| < 0 = false.
proof: Proof. by rewrite lt_neqAle normr_le0 normr_eq0 andNb. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)