Mathematics – Group Theory
Scientific paper
2005-03-02
Proc. Indian Acad. Sci. (Math. Sci.), Vol. 114, No. 3, August 2004, pp. 225-333
Mathematics
Group Theory
9 pages
Scientific paper
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).
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