proposition: Lemma map_regular_mx x : (regular_mx aR G x)^f = regular_mx rR G x.
proof: Proof. by apply/matrixP=> i j; rewrite !mxE rmorph_nat. 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)