proposition: Lemma map_gring_mx a : (gring_mx rG a)^f = gring_mx rGf a^f.
proof: Proof. by rewrite map_vec_mx map_mxM map_enveloping_algebra_mx. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop prime) mathcomp(ssralg poly polydiv finset fingroup morphism) mathcomp(perm automorphism quotient finalg action zmodp) mathcomp(commutator cyclic center pgroup matrix mxalgebra) mathcomp(mxpoly)