# 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)

Bib entry

@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} }