Nice elongations of primary abelian groups
Danchev, Peter V. (Plovdiv University "Paisii Hilendarski" (Bulgària). Department of Mathematics)
Keef, Patrick W. (Whitman College (Regne Unit). Department of Mathematics)
Data: |
2010 |
Resum: |
Suppose N is a nice subgroup of the primary abelian group G and A = G/N. The paper discusses various contexts in which G satisfying some property implies that A also satisfies the property, or visa versa, especially when N is countable. For example, if n is a positive integer, G has length not exceeding ω1 and N is countable, then G is n-summable iff A is n-summable. When A is separable and N is countable, we discuss the condition that any such G decomposes into the direct sum of a countable and a separable group, and we show that it is undecidable in ZFC whether this condition implies that A must be a direct sum of cyclics. We also relate these considerations to the study of nice bases for primary abelian groups. |
Drets: |
Tots els drets reservats. |
Llengua: |
Anglès |
Document: |
Article ; recerca ; Versió publicada |
Matèria: |
Nice subgroups ;
Elongations ;
Abelian groups ;
W1 -homomorphisms |
Publicat a: |
Publicacions matemàtiques, Vol. 54, Núm. 2 (2010) , p. 317-339, ISSN 2014-4350 |
Adreça alternativa: https://raco.cat/index.php/PublicacionsMatematiques/article/view/191386
DOI: 10.5565/PUBLMAT_54210_02
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