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Central sequence subfactors and double commutant properties
Journal article   Peer reviewed

Central sequence subfactors and double commutant properties

Keiko Kawamuro
International journal of mathematics, Vol.10(1), pp.53-77
1999
DOI: 10.1142/S0129167X99000033

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Abstract

First, we construct the Jones tower and tunnel of the central sequence subfactor arising from a hyperfinite type II 1 subfactor with finite index and finite depth, and prove each algebra has the double commutant property in the ultraproduct of the enveloping II 1 factor. Next, we show the equivalence between Popa's strong amenability and the double commutant property of the central sequence factor for subfactors as above without assuming the finite depth condition.

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