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arXiv 0904.3465math.AC
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对数导子模的分次贝蒂数

Graded Betti Numbers of the Logarithmic Derivation Module

Miguel Ángel Marco-Buzunariz, Jorge Martín-Morales

摘要:

令$Q\in \K[x_1,...,x_n] = S$为次数为$d$的齐次多项式。对数求导模块$D(Q)$及其自然推广的自由性已经被广泛研究。在自由情况下,为$D(Q) \simeq \bigoplus_{i=1}^n S(-d_i)$,其中$d_i$是模的指数;作为Saito-Ziegler准则的直接结果,公式$d = \sum_i d_i$成立。在本文中,我们给出了这个公式在非自由情况下的一个推广。此外,我们还证明了一个等价公式在拟齐次情形下也是成立的,并证明了它在多大程度上可以推广到任意多项式。

英文摘要:

Let $Q\in \K[x_1,...,x_n] = S$ be a homogeneous polynomial of degree $d$. The freeness of the logarithmic derivation module, $D(Q)$, and of its natural generalizations, has been widely studied. In the free case, $D(Q) \simeq \bigoplus_{i=1}^n S(-d_i)$ where the $d_i$'s are the exponents of the module; and as a direct consequence of the Saito-Ziegler criterion, the formula $d = \sum_i d_i$ holds. In this paper we give a generalization of this formula in the non-free case. Moreover, we show that an equivalent formula is also true in the quasi-homogeneous case, and show to what extent it can be generalized for arbitrary polynomials.

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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