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arXiv 2208.00985math.AC
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支持在$\mathfrak{C}$ -单项理想上的局部上同调模的分次分支

Graded components of local cohomology modules supported on $\mathfrak{C}$-monomial ideals

Tony J. Puthenpurakal, Sudeshna Roy

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20 pages
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摘要：

设$A$是特征为零的Dedekind整环，使得它在每个极大理想上的局部化具有与有限剩余域的混合特征.设$R=A[X_1,\ldots, X_n]$是多项式环，$I=(a_1U_1, \ldots, a_c U_c)\subseteq R$是理想，其中$a_j \in A$（不一定是单位）和$U_j$是$X_1, \ldots, X_n$中的单项式.我们称这样的理想$I$为$\mathfrak{C}$ -单项理想。考虑$R$上的标准多级。给出了局部上同调模$H^i_I(R)$对于$i \geq 0$的多阶分量的结构定理.进一步分析了这些构件的扭转部分和无扭转部分。我们表明，如果$A$是一个PID，那么每个组件可以写为一个直接的总和，其扭转部分和无挠部分。因此，我们得到它们的Bass数是有限的。

英文摘要：

Let $A$ be a Dedekind domain of characteristic zero such that its localization at every maximal ideal has mixed characteristic with finite residue field. Let $R=A[X_1,\ldots, X_n]$ be a polynomial ring and $I=(a_1U_1, \ldots, a_c U_c)\subseteq R$ an ideal, where $a_j \in A$ (not necessarily units) and $U_j$'s are monomials in $X_1, \ldots, X_n$. We call such an ideal $I$ as a $\mathfrak{C}$-monomial ideal. Consider the standard multigrading on $R$. We produce a structure theorem for the multigraded components of the local cohomology modules $H^i_I(R)$ for $i \geq 0$. We further analyze the torsion part and the torsion-free part of these components. We show that if $A$ is a PID then each component can be written as a direct sum of its torsion part and torsion-free part. As a consequence, we obtain that their Bass numbers are finite.

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