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arXiv math/0003061math.OA
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仿射建筑物和高阶Cuntz-Krieger代数的边界作用

Boundary actions for affine buildings and higher rank Cuntz-Krieger algebras

Guyan Robertson

摘要:

设$\G$是$\wt A_2$型仿射建筑物$\cB$的一组型旋转自同构。若$\G$自由作用在$\cB$的顶点上,且$Ω$是$\cB$的(极大)边界,则$C(\Om)\rtimes \G$是p. i. s. u.n. $C^*$ -代数.该代数具有类似于简单Cuntz-Krieger代数的结构理论,并且是T. Steger和G.罗伯森这些代数的K-理论可以在秩2的情况下显式计算。对于由$\wt A_2$建筑物上的边界作用引起的形式$C(\Om)\rtimes \G$的秩二例子,两个K群重合。

英文摘要:

Let $\G$ be a group of type rotating automorphisms of an affine building $\cB$ of type $\wt A_2$. If $\G$ acts freely on the vertices of $\cB$ with finitely many orbits, and if $Ω$ is the (maximal) boundary of $\cB$, then $C(\Om)\rtimes \G$ is a p.i.s.u.n. $C^*$-algebra. This algebra has a structure theory analogous to that of a simple Cuntz-Krieger algebra and is the motivation for a theory of higher rank Cuntz-Krieger algebras, which has been developed by T. Steger and G. Robertson. The K-theory of these algebras can be computed explicitly in the rank two case. For the rank two examples of the form $C(\Om)\rtimes \G$ which arise from boundary actions on $\wt A_2$ buildings, the two K-groups coincide.

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