arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1611.03431math.AC
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参数理想的Hilbert系数的界

Bounding Hilbert coefficients of parameter ideals

Anupam Saikia, Kumari Saloni

摘要:

设$(R,\mathfrak{m})$是维数为$d>0$、深度为R的Noether局部环$\geq d-1$ .设$Q$是$R$的参数理想.本文在对伴随分次环$G(Q)$的深度作一定假设的条件下,得到了Hilbert系数$e_i(Q)$的一致上下界.对于$2\leq i\leq d $,我们证明了(1)$e_i(Q)\leq 0$提供了深度$G(Q)\geq d-2$,(2)$e_i(Q)\geq -λ_R(H_{\mathfrak{m}}^{d-1}(R))$提供了深度$G(Q)\geq d-1$。证明了$e_3(Q)\leq 0$ .进一步,我们得到了最后一个系数$e_d(Q)$为零的必要条件.因此,我们的特点消失$e_2(Q)$。我们的结果推广了\cite [定理3.2]{goto-ozeki}和\cite [推论4.5]{Lori}.

英文摘要:

Let $(R,\mathfrak{m})$ be a Noetherian local ring of dimension $d>0$ and depth R$\geq d-1$. Let $Q$ be a parameter ideal of $R$. In this paper, we derive uniform lower and upper bounds for the Hilbert coefficient $e_i(Q)$ under certain assumptions on the depth of associated graded ring $G(Q)$. For $2\leq i\leq d $, we show that (1) $e_i(Q)\leq 0$ provided depth $G(Q)\geq d-2$ and (2) $e_i(Q)\geq -λ_R(H_{\mathfrak{m}}^{d-1}(R))$ provided depth $G(Q)\geq d-1$. It is proved that $e_3(Q)\leq 0$. Further, we obtain a necessary condition for the vanishing of the last coefficient $e_d(Q)$. As a consequence, we characterize the vanishing of $e_2(Q)$. Our results generalize \cite[Theorem 3.2]{goto-ozeki} and \cite[Corollary 4.5]{Lori}.

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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