proposition: Lemma algR_normr0_eq0 x : algR_norm x = 0 -> x = 0.
proof: Proof. by move=> /(congr1 val)/normr0_eq0 ?; apply/val_inj. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_fingroup all_algebra) mathcomp(all_solvable all_field) Abel(various)