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A characterization of depth 2 subfactors of II1 factors

机译:II1因子的深度2子因子的表征

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We characterize finite index depth 2 inclusions of type II1 factors in terms of actions of weak Kac algebras and weak C*-Hopf algebras. If N subset of M subset of M-1 subset of M-2 subset of ... is the Jones tower constructed from such an inclusion N subset of M, then B = M' boolean AND M-2 has a natural structure of a weak C*-Hopf algebra and there is a minimal action of B on M-1 such that M is the fixed point subalgebra of M-1 and M-2 is isomorphic to the crossed product of M-1 and B. This extends the well-known results for irreducible depth 2 inclusions. (C) 2000 Academic Press. [References: 27]
机译:我们根据弱Kac代数和弱C * -Hopf代数的作用来刻画II1类因子的有限索引深度2包含。如果...的M-2子集的M-1子集的M子集的N子集是从M的这种包含N子集构建的琼斯塔,则B = M'布尔AND M-2具有自然结构弱C * -Hopf代数,并且B对M-1的作用极小,因此M是M-1的不动点子代数,而M-2与M-1和B的叉积同构。不可约的深度2夹杂物的众所周知的结果。 (C)2000学术出版社。 [参考:27]

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