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- W2949726199 abstract "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 a singular cardinal nu of uncountable cofinality which is less than the first weakly compact cardinal and for every sequence of cardinals (nu_p : p in P) satisfying nu_p <= 2^{nu}, there is a torsion-free abelian group G of size nu such that nu_p equals the p-rank of Ext(G,Z) for every prime p and 2^{nu} is the torsion-free rank of Ext(G,Z)." @default.
- W2949726199 created "2019-06-27" @default.
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- W2949726199 date "2006-09-22" @default.
- W2949726199 modified "2023-09-27" @default.
- W2949726199 title "A characterization of Ext(G,Z) assuming V=L" @default.
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