Sh:514

• Magidor, M., & Shelah, S. (1994). \mathrm{Bext}^2(G,T) can be nontrivial, even assuming GCH. In Abelian group theory and related topics (Oberwolfach, 1993), Vol. 171, Amer. Math. Soc., Providence, RI, pp. 287–294. arXiv: math/9405214 DOI: 10.1090/conm/171/01778 MR: 1293148
• Abstract:
  Using the consistency of some large cardinals we produce a model of Set Theory in which the generalized continuum hypothesis holds and for some torsion-free abelian group G of cardinality \aleph_{\omega+1} and for some torsion group T, Bext^2(G,T)\not=0.
• published version (8p)

@incollection{Sh:514,
 author = {Magidor, Menachem and Shelah, Saharon},
 title = {{$\mathrm{Bext}^2(G,T)$ can be nontrivial, even assuming GCH}},
 booktitle = {{Abelian group theory and related topics (Oberwolfach, 1993)}},
 series = {Contemp. Math.},
 volume = {171},
 year = {1994},
 pages = {287--294},
 publisher = {Amer. Math. Soc., Providence, RI},
 mrnumber = {1293148},
 mrclass = {20K40 (03E35 03E55)},
 doi = {10.1090/conm/171/01778},
 note = {\href{https://arxiv.org/abs/math/9405214}{arXiv: math/9405214}},
 arxiv_number = {math/9405214}
}