proposition: Lemma all_rpK : all (mem K) rp.
proof: Proof. by rewrite K_eq; apply/allP/seqv_sub_adjoin. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_fingroup all_algebra) mathcomp(all_solvable all_field polyrcf) Abel(various classic_ext map_gal algR) Abel(char0 cyclotomic_ext real_closed_ext)