proposition: Lemma normalClosureSr E F : (F <= normalClosure E F)%VS.
proof: Proof. exact: subv_trans (field_subvMl _ _) (prodv_sub_normalClosure _ _). Qed.
imports: HB(structures) mathcomp(all_ssreflect all_fingroup all_algebra) mathcomp(all_solvable all_field) Abel(various char0)