proposition: Lemma kAEndSl (k K F : {subfield L}) : (k <= K)%VS -> (kAEnd K F \subset kAEnd k F).
proof: Proof. by move=> EK; apply/subsetP => x; rewrite !inE; apply: kAutS. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_fingroup all_algebra) mathcomp(all_solvable all_field) Abel(various char0)