On the p-rank of Ext(A,B) for countable abelian groups A and B
Group Theory
2014-01-22 v1
Abstract
In this note we show that the p-rank of Ext(A,B) for countable torsion-free abelian groups A and B is either countable or the size of the continuum.
Cite
@article{arxiv.1401.5317,
title = {On the p-rank of Ext(A,B) for countable abelian groups A and B},
author = {Lutz Struengmann and Saharon Shelah},
journal= {arXiv preprint arXiv:1401.5317},
year = {2014}
}