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Covering the Baire space by families which are not finitely dominating

It is consistent (relative to ZFC) that the union of max{b,g} many families in the Baire space which are not finitely dominating is not dominating. In particular, it is consistent that for each nonprincipal ultrafilter U, the cofinality of the reduced ultrapower w^w/U is greater than max{b,g}. The model is constructed by oracle chain condition forcing, to which we give a self-contained introduction.

preprint2010arXivOpen access
Heike MildenbergerSaharon ShelahBoaz Tsaban
math.COmath.GNmath.LO
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Heike MildenbergerSaharon ShelahBoaz Tsaban

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