$\rm{II}_{1}$因子的Masas和双模分解
Masas and Bimodule Decompositions of $\rm{II}_{1}$ Factors
摘要:
在\cite{MR2261688}中引入了$\rm{II}_{1}$因子中Masas的测度多重不变量,以区分具有相同Pukánszky不变量的Masas。本文研究测度重数不变量中的测度类。这等价于将标准希尔伯特空间作为一个关联的双模来研究。我们根据Baire类别方法(Jankov和von Neumann的选择原理)描述了任何Masa的类型。本文给出了Chifan关于正规化子的结果的第二个证明,并给出了弱渐近同态性质(WAHP)与\cite{MR2417416}中出现的奇异性等价性的测度论证明。
英文摘要:
The measure-multiplicity-invariant for masas in $\rm{II}_{1}$ factors was introduced in \cite{MR2261688} to distinguish masas that have the same Pukánszky invariant. In this paper we study the measure class in the measure-multiplicity-invariant. This is equivalent to studying the standard Hilbert space as an associated bimodule. We characterize the type of any masa depending on the left-right-measure using Baire category methods (selection principle of Jankov and von Neumann). We present a second proof of Chifan's result on normalisers and a measure theoretic proof of the equivalence of weak asymptotic homomorphism property (WAHP) and singularity that appeared in \cite{MR2417416}.
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