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Preprint Number 752
752. Pierre Simon (ICJ)
Rosenthal compacta and NIP formulas
Submission date: 22 July 2014.
We apply the work of Bourgain, Fremlin and Talagrand on compact subsets of the first Baire class to show new results about phi-types for phi NIP. In particular, we show that if M is a countable model, then an M-invariant phi-type is Borel definable. Also the space of M-invariant phi-types is a Rosenthal compactum, which implies a number of topological tameness properties.
Mathematics Subject Classification:
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