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arXiv 1407.0168math.AGmath.AC
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Jacobian理想与加权齐次奇点的合矢

Syzygies of Jacobian ideals and weighted homogeneous singularities

Alexandru Dimca, Gabriel Sticlaru

摘要:

设$V$是仅有孤立奇点的射影超曲面.我们证明了这些奇异性是加权齐次的当且仅当$V$的方程的偏导数之间的Koszul syzygies恰好是$V$的奇异轨迹子方案上的一般第一分量为零的syzygies。在这种情况下,这尤其对斋藤守彦和第一提交人提出的一个问题作出了肯定的回答。最后,我们解释了如何我们的结果可以被用来改善上市的雅可比合冲给定程度的计算机代数系统,如奇异,CoCoA或Macaulay2。

英文摘要:

Let $V$ be a projective hypersurface having only isolated singularities. We show that these singularities are weighted homogeneous if and only if the Koszul syzygies among the partial derivatives of an equation for $V$ are exactly the syzygies with a generic first component vanishing on the singular locus subscheme of $V$. This yields in particular a positive answer in this setting to a question raised by Morihiko Saito and the first author. Finally we explain how our result can be used to improve the listing of Jacobian syzygies of a given degree by a computer algebra system such as Singular, CoCoA or Macaulay2.

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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