completely decomposable group; type; ring
In this paper we consider completely decomposable torsion-free groups and we determine the subgroups which are ideals in every ring over such groups.
 Fried, E.: On the subgroups of an abelian group that are ideals in every ring
. Proc. Colloq. Abelian groups, Budapest, 1964, pp. 51–55. MR 0168670
| Zbl 0135.05901
 Najafizadeh, A., Aghdam, A. M., Karimi, F.: On the ideals of torsion–free rings of rank one and two. Math. Notes (to appear).