2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74362Suppose $G$ is an arbitrary additively written primary abelian group with a fixed large subgroup $L$. It is shown that $G$ is (a) summable; (b) $σ$-summable;\break (c) a $Σ$-group; (d) $p^{ω+1}$-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).9 pagesGroup Theory20K07; 20K10; 20K21text