Geodesic
The nonseparability of simply presented mixed groups
Commentationes Mathematicae Universitatis Carolinae, Tome 39 (1998) no. 1, pp. 1-5

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It is demonstrated that an isotype subgroup of a simply presented abelian group can be simply presented without being a separable subgroup. In particular, the conjecture based on a variety of special cases that Warfield groups are absolutely separable is disproved.
Classification : 20F05, 20K21, 20K27
Keywords: Warfield groups; simply presented; isotype subgroup; separable subgroup 
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Hill, Paul; Megibben, Charles. The nonseparability of simply presented mixed groups. Commentationes Mathematicae Universitatis Carolinae, Tome 39 (1998) no. 1, pp. 1-5. http://geodesic.mathdoc.fr/item/CMUC_1998__39_1_a0/