Sh:749
- Eklof, P. C., & Shelah, S. (2003). On the existence of precovers. Illinois J. Math., 47(1-2), 173–188. arXiv: math/0011228 http://projecteuclid.org/euclid.ijm/1258488146 MR: 2031314
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Abstract:
It is proved undecidable in ZFC + GCH whether every {\mathbb Z}-module has a ^{\perp}\{{\mathbb Z}\}-precover. - Version 2002-02-26_11 (16p) published version (16p)
Bib entry
@article{Sh:749,
author = {Eklof, Paul C. and Shelah, Saharon},
title = {{On the existence of precovers}},
journal = {Illinois J. Math.},
fjournal = {Illinois Journal of Mathematics},
volume = {47},
number = {1-2},
year = {2003},
pages = {173--188},
issn = {0019-2082},
mrnumber = {2031314},
mrclass = {20K40 (03E35)},
url = {http://projecteuclid.org/euclid.ijm/1258488146},
note = {\href{https://arxiv.org/abs/math/0011228}{arXiv: math/0011228}},
specialissue = {Special issue in honor of Reinhold Baer (1902--1979)},
arxiv_number = {math/0011228}
}