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math.LO2007
Test Groups for Whitehead Groups
Paul C. Eklof, Laszlo Fuchs, Saharon Shelah
We consider the question of when the dual of a Whitehead group is a test group for Whitehead groups. This turns out to be equivalent to the question of when the tensor product of t…
math.LO2004
On a non-vanishing Ext
Laszlo Fuchs, Saharon Shelah
The existence of valuation domains admitting non-standard uniserial modules for which certain Exts do not vanish was proved under Jensen's Diamond Principle. In this note, the same…