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arXiv 1401.7541math.OAmath.GR
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弱Haagerup性质

The weak Haagerup property

Søren Knudby

摘要:

引入了局部紧群的弱Haagerup性质,并证明了具有这种逼近性质的群类的几个遗传结果.类包含先验的所有弱顺从的群体和群体与(通常)Haagerup属性,但例子给出的群体与弱Haagerup属性是不弱顺从,不具有Haagerup属性。第二部分介绍了有限von Neumann代数的弱Haagerup性质,并证明了几个遗传结果。此外,一个离散群具有弱Haagerup性质当且仅当它的群von Neumann代数具有弱Haagerup性质。最后给出了两个具有不同弱Haagerup常数的II_1因子的例子。

英文摘要:

We introduce the weak Haagerup property for locally compact groups and prove several hereditary results for the class of groups with this approximation property. The class contains a priori all weakly amenable groups and groups with the (usual) Haagerup property, but examples are given of groups with the weak Haagerup property which are not weakly amenable and do not have the Haagerup property. In the second part of the paper we introduce the weak Haagerup property for finite von Neumann algebras, and we prove several hereditary results here as well. Also, a discrete group has the weak Haagerup property if and only if its group von Neumann algebra does. Finally, we give an example of two II_1 factors with different weak Haagerup constants.

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