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arXiv 2301.05052math.AG
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拟齐次奇点的矩阵分解

Matrix factorization for quasi-homogeneous singularities

Ananyo Dan, Agustín Romano-Velázquez

摘要:

给定一个孤立的、拟齐次的奇点$X$,证明了$X$上的秩为1的自反层群与由$\mathbb{C}^*$ -因子生成的自由阿尔贝群之间存在群同构,模线性等价.当$\dim(X)=2$,我们减少了寻找矩阵分解的任意自反$\mathcal{O}_X$ -模块的秩一自反层相同的问题。然后,我们列举了所有秩一自反层的矩阵分解。作为结果,我们证明了Etingof和Ginzburg关于点模的一个猜想.

英文摘要:

Given an isolated, quasi-homogeneous singularity $X$ we prove that there is a group isomorphism between the group of rank one reflexive sheaves on $X$ and the free abelian group generated by $\mathbb{C}^*$-divisors, modulo linear equivalence. When $\dim(X)=2$ we reduce the problem of finding matrix factorizations of arbitrary reflexive $\mathcal{O}_X$-modules to the same question on rank one reflexive sheaves. We then enumerate the matrix factorizations of all rank one reflexive sheaves. As a consequence, we prove a conjecture of Etingof and Ginzburg on point modules.

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