## Claudia Metelli

*On direct sums of $\Cal B^{(1)}$-groups *

Comment.Math.Univ.Carolinae 34,3 (1993) 587-591. **Abstract:**A necessary and sufficient condition is given for the direct sum of two $\Cal B^{(1)}$-groups to be (quasi-isomorphic to) a $\Cal B^{(1)}$-group. A $\Cal B^{(1)}$-group is a torsionfree Abelian group that can be realized as the quotient of a finite direct sum of rank 1 groups modulo a pure subgroup of rank 1.

**Keywords:** $\Cal B^{(1)}$-groups, Butler groups of finite rank

**AMS Subject Classification:** 20K15

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