Иерархии абелевых групп без кручения.
Н.Г. Хисамиев (1986)
Algebra i Logika
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Н.Г. Хисамиев (1986)
Algebra i Logika
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П.А. Крылов (1990)
Algebra i Logika
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С.В. Рычков (1988)
Algebra i Logika
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В.Д. Дзгоев (1982)
Algebra i Logika
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Н.Г. Хисамиев (1983)
Algebra i Logika
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Н.Г. Хисамиев (1999)
Algebra i Logika
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Greg Hjorth (2002)
Fundamenta Mathematicae
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The isomorphism relation on countable torsion free abelian groups is non-Borel.
Ladislav Procházka (1971)
Commentationes Mathematicae Universitatis Carolinae
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Edgar E. Enochs, Juan Rada (2005)
Czechoslovak Mathematical Journal
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In this article we characterize those abelian groups for which the coGalois group (associated to a torsion free cover) is equal to the identity.