proposition: Lemma map_powers_mx e : (powers_mx A e)^f = powers_mx A^f e.
proof: Proof. by apply/row_matrixP=> i; rewrite -map_row !rowK map_mxvec rmorphXn. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(div fintype tuple finfun bigop fingroup perm) mathcomp(ssralg zmodp matrix mxalgebra poly polydiv)