### On the p-rank of {$\bf Ext(A,B)$} for countable abelian groups $\bf A$ and $\bf B$

by Shelah and Struengmann. [ShSm:968]

In this note we show that the p-rank of Ext (A,B) for countable torsion-free abelian groups A and B is either countable or the size of the continuum.

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