The structure of Ext(A,Z) and GCH: possible co-Moore spaces
Paul C. Eklof, Saharon Shelah
Abstract
We consider what Ext(A,Z) can be when A is torsion-free and Hom(A,Z)=0. We thereby give an answer to a question of Golasinski and Goncalves which asks for the divisible Abelian groups which can be the type of a co-Moore space.
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