proposition: Lemma normrN x : `|- x| = `|x|.
proof: Proof. by rewrite -mulN1r normM -[RHS]mul1r normrN1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)