A combinatorial principle equivalent to the existence of non-free Whitehead groups
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A combinatorial principle equivalent to the existence of non-free Whitehead groups

  • Author(s): Eklof, Paul C
  • Shelah, Saharon
  • et al.
Abstract

As a consequence of identifying the principle described in the title, we prove that for any uncountable cardinal lambda, if there is a lambda-free Whitehead group of cardinality lambda which is not free, then there are many ``nice'' Whitehead groups of cardinality lambda which are not free.

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