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arXiv 1011.4154math.OAmath.KT
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图代数K-理论中的指数映射

Index maps in the K-theory of graph algebras

Toke M. Carlsen, Søren Eilers, Mark Tomforde

摘要:

设$C^*(E)$是与图E相关联的图$C^*$ -代数,J是$C^*(E)$中的规范不变理想.利用与$E$相关的邻接矩阵,计算了相关扩张的$K$ -理论中的循环六项正合序列.有序六项正合列是几类图$C^*$ -代数的完全稳定同构不变量,例如那些包含唯一真非平凡理想的图。此外,在许多其他情况下,这样的序列的无限集合包括完全不变量。我们的研究结果允许显式计算的不变量,给出一个确切的序列的内核和cokernels矩阵的顶点矩阵的$E$。

英文摘要:

Let $C^*(E)$ be the graph $C^*$-algebra associated to a graph E and let J be a gauge invariant ideal in $C^*(E)$. We compute the cyclic six-term exact sequence in $K$-theory of the associated extension in terms of the adjacency matrix associated to $E$. The ordered six-term exact sequence is a complete stable isomorphism invariant for several classes of graph $C^*$-algebras, for instance those containing a unique proper nontrivial ideal. Further, in many other cases, infinite collections of such sequences comprise complete invariants. Our results allow for explicit computation of the invariant, giving an exact sequence in terms of kernels and cokernels of matrices determined by the vertex matrix of $E$.

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