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Preprint Number 1004
1004. Isaac Goldbring and Bradd Hart
On the theories of McDuff's II_1 factors
Submission date: 4 February 2016.
Recently, Boutonnet, Chifan, and Ioana proved that McDuff's family of continuum many pairwise nonisomorphic separable II_1 factors are in fact pairwise non-elementarily equivalent by proving that any ultrapowers of two distinct members of the family are nonsiomorphic. We use Ehrenfeucht-Fraisse games to provide an upper bound on the quantifier-depth of sentences which distinguish these theories.
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