A note on commuting squares arising from automorphisms on subfactors
A note on commuting squares arising from automorphisms on subfactors
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关于由子因子自同构引起的通勤平方的注解
DOI:
10.1142/s0129167x99000082
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发表时间:
1999
影响因子:
0.6
通讯作者:
P. Loi
中科院分区:
文献类型:
--
作者:
P. Loi
Using an idea due to Popa, we can associate a commuting square of factors to any given finite set of automorphisms acting on an inclusion of factors of finite index. We use this setting to obtain a simple proof of Popa's classification theorem of strongly outer actions of finitely generated discrete strongly amenable groups on a strongly amenable inclusion of type II1 factors. We also obtain a new complete outer conjugacy invariant for arbitrary automorphisms, which contains the higher obstruction of Kawahigashi and the standard invariant as a special case.