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arXiv 1004.4979math.RAmath.KTmath.OA
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分离图的Leavitt路代数

Leavitt path algebras of separated graphs

P. Ara, K. R. Goodearl

摘要:

本文将与有向图$E$相关联的Leavitt路代数的构造推广到包含由$E$的顶点所产生的边集的划分组成的$C$族.新的代数,$L_K(E,C)$,分析他们的同源性,理想理论,K-理论。证明了这些代数是遗传的,并且证明了任何锥交换幺半群都是其中一个代数上的非生成投射模的同构类的幺半群$\mon{L_K(E,C)}$. $L_K(E,C)$的迹理想的格由图论数据确定,即作为由$E^0$的子集和$C$的子集组成的某些对的格。必要条件$\mon{L_K(E,C)}$是一个细化么半群的开发,连同一个结构,嵌入$(E,C)$在一个分离的图$(E_+,C^+)$,使$\mon{L_K(E_+,C^+)}$有细化。

英文摘要:

The construction of the Leavitt path algebra associated to a directed graph $E$ is extended to incorporate a family $C$ consisting of partitions of the sets of edges emanating from the vertices of $E$. The new algebras, $L_K(E,C)$, are analyzed in terms of their homology, ideal theory, and K-theory. These algebras are proved to be hereditary, and it is shown that any conical abelian monoid occurs as the monoid $\mon{L_K(E,C)}$ of isomorphism classes of finitely generated projective modules over one of these algebras. The lattice of trace ideals of $L_K(E,C)$ is determined by graph-theoretic data, namely as a lattice of certain pairs consisting of a subset of $E^0$ and a subset of $C$. Necessary conditions for $\mon{L_K(E,C)}$ to be a refinement monoid are developed, together with a construction that embeds $(E,C)$ in a separated graph $(E_+,C^+)$ such that $\mon{L_K(E_+,C^+)}$ has refinement.

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