布尔逆幺半群上的不变平均
Invariant means on Boolean inverse monoids
摘要:
经典的不变平均理论在悖论分解理论中起着重要的作用,它是基于通常被称为“伪群”的东西。这样的伪群实际上是布尔逆幺半群的具体例子,它在非交换Stone对偶下产生了etale拓扑广群。相应地,我们提出了任意布尔逆幺半群上的不变平均理论。我们的主要定理是当一个布尔逆幺半群承认一个不变平均的特征。这推广了经典的塔斯基替代证明,例如,由德拉哈普和Skandalis,但使用不同的方法。
英文摘要:
The classical theory of invariant means, which plays an important role in the theory of paradoxical decompositions, is based upon what are usually termed `pseudogroups'. Such pseudogroups are in fact concrete examples of the Boolean inverse monoids which give rise to etale topological groupoids under non-commutative Stone duality. We accordingly initiate the theory of invariant means on arbitrary Boolean inverse monoids. Our main theorem is a characterization of when a Boolean inverse monoid admits an invariant mean. This generalizes the classical Tarski alternative proved, for example, by de la Harpe and Skandalis, but using different methods.
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