Torsion classes and torsion prime selectors of -groups
Dao Rong Tong (2000)
Mathematica Slovaca
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Dao Rong Tong (2000)
Mathematica Slovaca
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Jorge Martinez (1975)
Czechoslovak Mathematical Journal
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Paul Hill, Charles K. Megibben (1998)
Commentationes Mathematicae Universitatis Carolinae
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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.