proposition: Lemma normr_gt0 v : `|v| > 0 = (v != 0).
proof: Proof. by rewrite lt_def normr_eq0 normr_ge0 andbT. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)