proposition: Lemma cfRepr_sub n (rG : mx_representation algC G n) (sHG : H \subset G) : cfRepr (subg_repr rG sHG) = 'Res[H] (cfRepr rG).
proof: Proof. by apply/cfun_inP => x Hx; rewrite cfResE // !cfunE Hx (subsetP sHG). Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype choice ssrnat seq) mathcomp(path div fintype tuple finfun bigop prime order) mathcomp(ssralg poly finset gproduct fingroup morphism) mathcomp(perm automorphism quotient finalg action zmodp) mathcomp(commutator cyclic center pgroup nilpotent sylow) mathcomp(abelian matrix mxalgebra mxpoly mxrepresentation) mathcomp(vector ssrnum algC classfun archimedean)