proposition: Lemma normCi : `|'i| = 1 :> C.
proof: Proof. by apply/eqP; rewrite -(@pexpr_eq1 _ _ 2) // -normrX sqrCi 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)