proposition: Lemma comm_mx_stable_geigenspace n (f g : 'M_n) a : comm_mx f g -> stablemx (geigenspace f a) g.
proof: Proof. exact: comm_mx_stable_kermxpoly. 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)