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arXiv 1108.0352math.RAmath.KTmath.OA
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Leavitt路代数的张量积

Tensor products of Leavitt path algebras

Pere Ara, Guillermo Cortiñas

摘要:

计算域$k$上Leavitt路代数的Hochschild同调.作为一个应用,我们表明,$L_2$和$L_2\otimes L_2$有不同的霍赫希尔德同调,所以他们不是森田等价,特别是他们不是同构的。类似地,$L_\infty$和$L_\infty\otimes L_\infty$的区别在于它们的霍赫希尔德同调,因此它们也不是森田等价物。相比之下,我们表明$K$ -理论无法区分这些代数;我们有$K_*(L_2)=K_*(L_2\otimes L_2)=0$和$K_*(L_\infty)=K_*(L_\infty\otimes L_\infty)=K_*(k)$。

英文摘要:

We compute the Hochschild homology of Leavitt path algebras over a field $k$. As an application, we show that $L_2$ and $L_2\otimes L_2$ have different Hochschild homologies, and so they are not Morita equivalent; in particular they are not isomorphic. Similarly, $L_\infty$ and $L_\infty\otimes L_\infty$ are distinguished by their Hochschild homologies and so they are not Morita equivalent either. By contrast, we show that $K$-theory cannot distinguish these algebras; we have $K_*(L_2)=K_*(L_2\otimes L_2)=0$ and $K_*(L_\infty)=K_*(L_\infty\otimes L_\infty)=K_*(k)$.

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