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arXiv 1701.03325math.RT
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n-完全代数的张量积

Tensor products of n-complete algebras

Andrea Pasquali

摘要:

若$A$和$B$是$n$ -和$m$ -表示有限的$k$ -代数,则它们的张量积$Λ= A\otimes_k B$一般不是$(n+m)$ -表示有限的.然而,我们证明了,如果$A$和$B$是非循环的,并满足较弱的假设$n$ -和$m$ -完全,那么$Λ$是$(n+m)$ -完全的。这反映了这样一个事实,即采用更高的Auslander代数一般不保持$d$ -表示有限性,但它确实保持了$d$ -完全性。作为推论,我们得到了Herschend和Iyama利用扭曲的分数Calabi-Yau性质所得到的$Λ$是$(n+m)$ -表示有限的必要条件.

英文摘要:

If $A$ and $B$ are $n$- and $m$-representation finite $k$-algebras, then their tensor product $Λ= A\otimes_k B$ is not in general $(n+m)$-representation finite. However, we prove that if $A$ and $B$ are acyclic and satisfy the weaker assumption of $n$- and $m$-completeness, then $Λ$ is $(n+m)$-complete. This mirrors the fact that taking higher Auslander algebra does not preserve $d$-representation finiteness in general, but it does preserve $d$-completeness. As a corollary, we get the necessary condition for $Λ$ to be $(n+m)$-representation finite which was found by Herschend and Iyama by using a certain twisted fractionally Calabi-Yau property.

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