On the classification of inductive limits of II$_1$ factors with spectral gap

Details On the classification of inductive limits of II$_1$ factors with spectral gap On the classification of inductive limits of II$_1$ factors with spectral gap

2009-10-13

arxiv.org/abs/0910.2241v1

Mathematics

Operator Algebras

14 pages

Scientific paper

We consider II$_1$ factors $M$ which can be realized as inductive limits of subfactors, $N_n \nearrow M$, having spectral gap in $M$ and satisfying the bi-commutant condition $(N_n'\cap M)'\cap M=N_n$. Examples are the enveloping algebras associated to non-Gamma subfactors of finite depth, as well as certain crossed products of McDuff factors by amenable groups. We use deformation/rigidity techniques to obtain classification results for such factors.

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