proposition: Lemma map_hom_algE (f : 'End(L)) (x : L) : map_hom iota f (iota x) = iota (f x).
proof: Proof. by rewrite lker0_map_homE// AHom_lker0. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_fingroup all_algebra) mathcomp(all_solvable all_field) Abel(various char0)