proposition: Lemma comm_mx_stable (f g : 'M[F]_n) : comm_mx f g -> stablemx f g.
proof: Proof. by move=> comm_fg; rewrite [_ *m _]comm_fg mulmx_sub. 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)