proposition: Lemma map_eigenspace n (g : 'M_n) a : (eigenspace g a)^f = eigenspace g^f (f a).
proof: Proof. by rewrite map_kermx map_mxB ?map_scalar_mx. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg finalg zmodp matrix)