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Nonstandard combinatorial ultrafilters and a new local witness model

Heil, Johannes et al.
arXiv (All) · Papers
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A central object in the theory of proof complexity generators is Krajicek's local witness model. We construct a new such model as a definable ultrapower using a definable version of a selective ultrafilter over a model of arithmetic. We transfer some set theory of combinatorial ultrafilters to the d
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