proposition: Lemma normr_ge0 v : 0 <= `|v|.
proof: Proof. by rewrite ger0_def normr_id. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)