proposition: Lemma cfextprod0r g : g \ox (0 : 'CF(H)) = 0.
proof: Proof. Proof using. by rewrite linear0. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg fingroup morphism perm gproduct) mathcomp(ssrnum matrix vector mxalgebra algC) mathcomp(classfun character mxrepresentation) tools ordcast partition sorted permcomp cycles cycletype permcent