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math.LO2006★ 1 cited
A characterization of Ext(G,Z) assuming V=L
Saharon Shelah, Lutz Strüngmann
In this paper we complete the characterization of Ext(G,Z) under Godel's axiom of constructibility for any torsion-free abelian group G . In particular, we prove in (V=L) that, for…
math.LO2006
On the p-rank of Ext_Z(G,Z) in certain models of ZFC
Saharon Shelah, Lutz Strüngmann
We show that if the existence of a supercompact cardinal is consistent with ZFC, then it is consistent with ZFC that the p-rank of Ext_Z(G, Z) is as large as possible for every pri…