Covering the Baire space by families which are not finitely dominating

Annals of Pure and Applied Logic 140 (1):60-71 (2006)
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Abstract

It is consistent that each union of many families in the Baire space which are not finitely dominating is not dominating. In particular, it is consistent that for each nonprincipal ultrafilter , the cofinality of the reduced ultrapower is greater than . The model is constructed by oracle chain condition forcing, to which we give a self-contained introduction

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