proposition: Lemma eigenvalue_map n (g : 'M_n) a : eigenvalue g^f (f a) = eigenvalue g a.
proof: Proof. by rewrite /eigenvalue -map_eigenspace map_mx_eq0. 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)