## Abstract In this paper we investigate the properties of automorphism groups of countable short recursively saturated models of arithmetic. In particular, we show that Kaye's Theorem concerning the closed normal subgroups of automorphism groups of countable recursively saturated models of arithme
A Galois Correspondence for II1 Factors and Quantum Groupoids
โ Scribed by Dmitri Nikshych; Leonid Vainerman
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 273 KB
- Volume
- 178
- Category
- Article
- ISSN
- 0022-1236
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โฆ Synopsis
We establish a Galois correspondence for finite quantum groupoid actions on II 1 factors and show that every finite index and finite depth subfactor is an intermediate subalgebra of a quantum groupoid crossed product. Moreover, any such subfactor is completely and canonically determined by a quantum groupoid and its coideal V-subalgebra. This allows us to express the bimodule category of a subfactor in terms of the representation category of a corresponding quantum groupoid and the principal graph as the Bratteli diagram of an inclusion of certain finite-dimensional C*-algebras related to it.
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