Filtration equivalent aleph_1-separable abelian groups of cardinality aleph_1

preprint2006arXivOpen access

Abstract

We show that it is consistent with ordinary set theory ZFC and the generalized continuum hypothesis that there exist two separable abelian groups of cardinality aleph_1 which are filtration equivalent and one is a Whitehead group but the other is not. This solves one of the open problems of Eklof and Mekler.

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