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
P. Loi
中科院分区:
数学4区
文献类型:
--
作者:
P. Loi

文献摘要

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相似文献

利用Popa的一个思想,我们可以将因子的交换平方与任何给定的自同构集联系起来,这些自同构集作用于有限指标的因子的包含。利用这一设置,我们得到了有限生成离散强可服从群在强可服从II1型因子包含上的强外作用的Popa分类定理的一个简单证明。我们还得到了任意自同构的一个新的完全外共轭不变量,它包含了Kawahigashi的高阻性和作为特例的标准不变量。
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.