Hyperlinearity, essentially free actions and L2-invariants. The sofic property

Hyperlinearity, essentially free actions and L2-invariants. The sofic property
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超线性,本质上是自由动作和 L2 不变量。

DOI:
10.1007/s00208-005-0640-8
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发表时间:
2004
影响因子:
1.4
通讯作者:
E. Szabó
E. Szabó
中科院分区:
数学2区
文献类型:
--
作者:
G. Elek;E. Szabó

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本文证明了Connes的嵌入猜想对sofic群的von Neumann代数成立,即sofic群是超线性的。因此,我们提供了一些新的超线性的例子。我们还证明了行列式猜想对sofic群也成立。我们引入了本质自由行动和顺从行动的概念,并研究了它们的性质。
Abstract.We prove that Connes’ Embedding Conjecture holds for the von Neumann algebras of sofic groups, that is sofic groups are hyperlinear. Hence we provide some new examples of hyperlinearity. We also show that the Determinant Conjecture holds for sofic groups as well. We introduce the notion of essentially free actions and amenable actions and study their properties.