### The structure of ${\rm Ext}(A,{\mathbb Z})$ and GCH: possible co-Moore spaces

by Eklof and Shelah. [EkSh:717]

Math Zeitschrift, 2002

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 Gon c {c}alves which asks
for the divisible Abelian groups which can be the type of a co-Moore
space.

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