A classification of all finite index subfactors for a class of group-measure space II_1 factors

Details A classification of all finite index subfactors for a class of group-measure space II_1 factors A classification of all finite index subfactors for a class of group-measure space II_1 factors

2010-02-10

arxiv.org/abs/1002.2129v2

Journal of Noncommutative Geometry 5 (2011), 523-545

Mathematics

Operator Algebras

Minor modifications, final version

Scientific paper

We provide a family of group measure space II_1 factors for which all finite
index subfactors can be explicitly listed. In particular, the set of all
indices of irreducible subfactors can be computed. Concrete examples show that
this index set can be any set of natural numbers that is closed under taking
divisors.

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