proposition: Lemma algRpfactor_eq0 x : (algRpfactor x == 0) = false.
proof: Proof. by rewrite -size_poly_eq0 size_algRpfactor. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_fingroup all_algebra) mathcomp(all_solvable all_field) Abel(various)