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arXiv 1805.04568math.AC
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关于θ不变量的消失及Huneke和Wiegand的一个猜想

On the vanishing of theta invariant and a conjecture of Huneke and Wiegand

Olgur Celikbas

摘要:

Huneke和Wiegand证明了:如果$M$是一维Cohen-Macaulay局部环$R$上秩为零的非自由无扭模,则$M$与其代数对偶的张量积有挠.如果$R$是Gorenstein,这个猜想是Auslander和Reiten关于自扩张消失的著名猜想的一个特例,该猜想源于有限维代数的表示论。如果$R$是一维Cohen-Macaulay环,使得$R=S/(f)$对某个局部环$(S, \mathfrak{n})$,且$S$上有一个非零因子$f \in \mathfrak{n}^2$,我们利用Hochster θ不变量证明了在$S$上具有有限投射维数的$R$ -模$M$满足猜想中提出的挠条件.一路上,我们给出了几个应用程序,我们的论点有关的扭转性质的张量积的模块。

英文摘要:

Huneke and Wiegand conjectured that, if $M$ is a finitely generated, non-free, torsion-free module with rank over a one-dimensional Cohen-Macaulay local ring $R$, then the tensor product of $M$ with its algebraic dual has torsion. This conjecture, if $R$ is Gorenstein, is a special case of a celebrated conjecture of Auslander and Reiten on the vanishing of self extensions that stems from the representation theory of finite-dimensional algebras. If $R$ is a one-dimensional Cohen-Macaulay ring such that $R=S/(f)$ for some local ring $(S, \mathfrak{n})$, and a non zero-divisor $f \in \mathfrak{n}^2$ on $S$, we make use of Hochster's theta invariant and prove that such $R$-modules $M$ which have finite projective dimension over $S$ satisfy the proposed torsion condition of the conjecture. Along the way we give several applications of our argument pertaining to torsion properties of tensor products of modules.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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