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arXiv 1908.09241math.OAmath.KT
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近似理想结构与K-理论

Approximate ideal structures and K-theory

Rufus Willett

摘要:

引入了$C^*$ -代数的近似理想结构的概念,并以此作为研究$K$ -理论群的工具.这个概念的动机是经典的迈耶-Vietoris序列,理论的核尺寸介绍了冬季和撒迦利亚,并介绍了动力复杂性理论的Guentner,余,和作者。我们的方法的一个主要灵感来自最近的工作Oyono-Oyono和Yu在设置控制$K$ -过滤C* 代数理论,我们不,但是,在本文中使用这种语言。我们给出两个主要的应用。第一个是一个消失的结果,$K$ -理论是相关的鲍姆-康纳斯猜想。第二个是$C^*$ -代数$K$ -理论中Künneth公式的持久性结果:粗略地说,如果$A$可以分解成一对子代数$(C,D)$,使得$C$,$D$和$C\cap D$都满足Künneth公式,那么$A$本身满足Künneth公式。

英文摘要:

We introduce a notion of approximate ideal structure for a $C^*$-algebra, and use it as a tool to study $K$-theory groups. The notion is motivated by the classical Mayer-Vietoris sequence, by the theory of nuclear dimension as introduced by Winter and Zacharias, and by the theory of dynamical complexity introduced by Guentner, Yu, and the author. A major inspiration for our methods comes from recent work of Oyono-Oyono and Yu in the setting of controlled $K$-theory of filtered C*-algebras; we do not, however, use that language in this paper. We give two main applications. The first is a vanishing result for $K$-theory that is relevant to the Baum-Connes conjecture. The second is a permanence result for the Künneth formula in $C^*$-algebra $K$-theory: roughly, this says that if $A$ can be decomposed into a pair of subalgebras $(C,D)$ such that $C$, $D$, and $C\cap D$ all satisfy the Künneth formula, then $A$ itself satisfies the Künneth formula.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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