arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2106.04855math.AG
收藏

行列式奇点

Determinantal Singularities

Anne Frühbis-Krüger, Matthias Zach

摘要:

我们调查行列式奇点,他们的变形,和他们的拓扑结构。这类奇点在几个不同的方面推广了完全相交的良好研究情况,但表现出过多的新现象,例如非孤立奇点,它们是不可确定的,或具有低连通性的平滑; $(\mathbb{C}^3,0)$中坐标轴的并集已经是行列式的,但不是完全相交。我们从代数背景开始,然后继续讨论在这种情况下展开和变形的微妙的相互作用,包括调查的情况下,决定性的超曲面,科恩-麦考利余维$2$和Gorenstein余维$3$奇异性,和决定性的合理的表面奇异性。最后,我们讨论了必要的smoothings,并提供了一个附录列出已知的简单的行列式奇点分类。

英文摘要:

We survey determinantal singularities, their deformations, and their topology. This class of singularities generalizes the well studied case of complete intersections in several different aspects, but exhibits a plethora of new phenomena such as for instance non-isolated singularities which are finitely determined, or smoothings with low connectivity; already the union of the coordinate axes in $(\mathbb{C}^3,0)$ is determinantal, but not a complete intersection. We start with the algebraic background and then continue by discussing the subtle interplay of unfoldings and deformations in this setting, including a survey of the case of determinantal hypersurfaces, Cohen-Macaulay codimension $2$ and Gorenstein codimension $3$ singularities, and determinantal rational surface singularities. We conclude with a discussion of essential smoothings and provide an appendix listing known classifications of simple determinantal singularities.

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。

↑