Partition properties of $ω_1$ compatible with CH

Volume 152 / 1997

Uri Abraham, Stevo Todorčević Fundamenta Mathematicae 152 (1997), 165-181 DOI: 10.4064/fm-152-2-165-181


A combinatorial statement concerning ideals of countable subsets of ω is introduced and proved to be consistent with the Continuum Hypothesis. This statement implies the Suslin Hypothesis, that all (ω, ω*)-gaps are Hausdorff, and that every coherent sequence on ω either almost includes or is orthogonal to some uncountable subset of ω.


  • Uri Abraham
  • Stevo Todorčević

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