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arXiv 2408.02532math.AGmath.CTmath.RT
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任意特征下有理二重点的奇点范畴

Singularity categories of rational double points in arbitrary characteristic

Yuta Takashima, Hokuto Uehara

AI总结:

本文在任意特征下建立了有理二重点的奇点范畴与单边laced Dynkin图的一一对应,并利用正特征下非taut的有理二重点构造了Hua-Keller定理的反例。

摘要:

我们建立了任意特征下有理二重点的奇点范畴与单边laced Dynkin图之间的一一对应关系。这一对应在特征零情形是众所周知的,因为在特征零情形有理二重点是商奇点,而在正特征情形则未必如此。考虑到在特征二、三或五时有些有理二重点不是taut的,我们可以看到存在两个有理二重点,它们不是解析同构的,但它们的奇点范畴是三角等价的。作为一个应用,我们在正特征情形构造了Hua和Keller一个定理的反例:超曲面奇点的dg奇点范畴决定其Tyurina代数。

英文摘要:

We establish a one-to-one correspondence between the singularity categories of rational double points and the simply-laced Dynkin graphs in arbitrary characteristic. This correspondence is well-known in characteristic zero since the rational double points are quotient singularities in characteristic zero whereas not necessarily in positive characteristic. Considering some rational double points are not taut in characteristic two, three or five, we can see there exist two rational double points which are not analytically isomorphic but whose singularity categories are triangulated equivalent. As an application, we construct a counter-example in positive characteristic of a theorem of Hua and Keller: the dg singularity category of a hypersurface singularity determines its Tyurina algebra.

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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