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arXiv 1903.09406math.RA
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Leavitt路代数的天才幺半群

The talented monoid of a Leavitt path algebra

Roozbeh Hazrat, Huanhuan Li

摘要:

有向图的几何和与之相关联的Leavitt路代数的代数结构之间有着紧密的联系.本文证明了图的几何和与之相关联的某个幺半群的结构之间有着类似的联系.这个幺半群同构于自然具有Z-作用的Leavitt路代数的分次K0-群的正锥.作为一个例子,我们证明了一个图有一个圈没有出口当且仅当幺半群有一个周期元素。因此一个图有条件(L)当且仅当群Z自由作用在幺半群上。我们继续表明,莱维特路代数的代数结构(如简单性,纯粹无限简单性,或理想格)可以完全通过这个幺半群来描述。因此,两个莱维特路代数的幺半群(或分次K0)之间的同构意味着代数具有相似的代数结构。这些都证实了分次Grothendieck群可能是Leavitt路代数分类的一个广受欢迎的完全不变量。

英文摘要:

There is a tight relation between the geometry of a directed graph and the algebraic structure of a Leavitt path algebra associated to it. In this note, we show a similar connection between the geometry of the graph and the structure of a certain monoid associated to it. This monoid is isomorphic to the positive cone of the graded K0-group of the Leavitt path algebra which is naturally equipped with a Z-action. As an example, we show that a graph has a cycle without an exit if and only if the monoid has a periodic element. Consequently a graph has Condition (L) if and only if the group Z acts freely on the monoid. We go on to show that the algebraic structure of Leavitt path algebras (such as simplicity, purely infinite simplicity, or the lattice of ideals) can be described completely via this monoid. Therefore an isomorphism between the monoids (or graded K0's) of two Leavitt path algebras implies that the algebras have similar algebraic structures. These all confirm that the graded Grothendieck group could be a sought-after complete invariant for the classification of Leavitt path algebras.

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