Sh:968

• Shelah, S., & Strüngmann, L. H. (2014). On the p-rank of \mathrm{Ext}(A,B) for countable abelian groups A and B. Israel J. Math., 199(2), 567–572. arXiv: 1401.5317 DOI: 10.1007/s11856-013-0039-2 MR: 3219548
• Abstract:
  In this note we show that the p-rank of {\rm Ext}(A,B) for countable torsion-free abelian groups A and B is either countable or the size of the continuum.
• Version 2014-01-20_11 (5p) published version (6p)

@article{Sh:968,
 author = {Shelah, Saharon and Str{\"u}ngmann, Lutz H.},
 title = {{On the $p$-rank of $\mathrm{Ext}(A,B)$ for countable abelian groups $A$ and $B$}},
 journal = {Israel J. Math.},
 fjournal = {Israel Journal of Mathematics},
 volume = {199},
 number = {2},
 year = {2014},
 pages = {567--572},
 issn = {0021-2172},
 mrnumber = {3219548},
 mrclass = {20K35 (20K20)},
 doi = {10.1007/s11856-013-0039-2},
 note = {\href{https://arxiv.org/abs/1401.5317}{arXiv: 1401.5317}},
 arxiv_number = {1401.5317}
}