Suppose $G$ is an arbitrary additively written primary abelian group with a fixed large subgroup $L$. It is shown that $G$ is (a) summable; (b) $\sigma$-summable;\break (c) a $\Sigma$-group; (d) $p^{ \omega+1}$-projective only when so is $L$. These claims extend results of such a kind obtained by Benabdallah, Eisenstadt, Irwin and Poluianov, { \it Acta Math. Acad. Sci. Hungaricae} (1970) and Khan, { \it Proc. Indian Acad. Sci. Sect. A} (1978).
Categories: math.GR