Model theory of operator algebras III: Elementary equivalence and II_1 factors

Details Model theory of operator algebras III: Elementary equivalence and II_1 factors Model theory of operator algebras III: Elementary equivalence and II_1 factors

2011-11-03

arxiv.org/abs/1111.0998v1

Mathematics

Operator Algebras

16 pages

Scientific paper

We use continuous model theory to obtain several results concerning isomorphisms and embeddings between II_1 factors and their ultrapowers. Among other things, we show that for any II_1 factor M, there are continuum many nonisomorphic separable II_1 factors that have an ultrapower isomorphic to an ultrapower of M. We also give a poor man's resolution of the Connes Embedding Problem: there exists a separable II_1 factor such that all II_1 factors embed into one of its ultrapowers.

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