The nonseparability of simply presented mixed groups

@inproceedings{Hill2010TheNO,
  title={The nonseparability of simply presented mixed groups},
  author={Paul Hill and Charles Megibben},
  year={2010}
}
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.