A characterization of countable Butler groups
L. Bican, L. Salce, J. Štěpán (1985)
Rendiconti del Seminario Matematico della Università di Padova
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L. Bican, L. Salce, J. Štěpán (1985)
Rendiconti del Seminario Matematico della Università di Padova
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Kulumani M. Rangaswamy (1994)
Commentationes Mathematicae Universitatis Carolinae
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It is shown, under ZFC, that a -group has the interesting property of being -prebalanced in every torsion-free abelian group in which it is a pure subgroup. As a consequence, we obtain alternate proofs of some well-known theorems on -groups.
Ladislav Bican, K. M. Rangaswamy (1995)
Rendiconti del Seminario Matematico della Università di Padova
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L. G. Kovács (1963)
Czechoslovak Mathematical Journal
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