决议超过严格的完整决议

Tony J. Puthenpurakal
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引用次数: 0

摘要

让 $(Q, \mathfrak{n})$ 是一个正则局部环,让 $f_1, \ldots, f_c \in\mathfrak{n}^2$ 是一个 $Q$ 正则序列。设 $(A, \mathfrak{m}) =(Q/(\mathbf{f}), \mathfrak{n}/(\mathbf{f}))$.进一步假设初始形式 $f_1^*,\ldots,f_c^*$ 构成一个 $G(Q) = \bigoplus_{n \geq0}\mathfrak{n}^i/\mathfrak{n}^{i+1}$ 不规则序列。在不失一般性的前提下,假设 $ord_Q(f_1) \geq ord_Q(f_2) \geq \cdots \geq ord_Q(f_c)$.让 $M$ 是一个有限生成的 $A$ 模块,并让 $(\mathbb{F}, \partial)$ 是 $M$ 的氨基自由解析。然后我们证明 $ord(\partial_i) \leqord_Q(f_1) - 1$ 对于所有 $i \gg 0$。我们还构造了一个 MCM $A$ 模块 $M$,使得对于所有 $i \geq 0$,$ord(\partial_{2i+1}) = ord_Q(f_1) - 1$。我们还给出了一个更为简单的证明,涉及任意完全交环(不一定是严格的)上模块的最小自由解析中映射的小数理想的周期性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Resolutions over strict complete resolutions
Let $(Q, \mathfrak{n})$ be a regular local ring and let $f_1, \ldots, f_c \in \mathfrak{n}^2$ be a $Q$-regular sequence. Set $(A, \mathfrak{m}) = (Q/(\mathbf{f}), \mathfrak{n}/(\mathbf{f}))$. Further assume that the initial forms $f_1^*, \ldots, f_c^*$ form a $G(Q) = \bigoplus_{n \geq 0}\mathfrak{n}^i/\mathfrak{n}^{i+1}$-regular sequence. Without loss of any generality assume $ord_Q(f_1) \geq ord_Q(f_2) \geq \cdots \geq ord_Q(f_c)$. Let $M$ be a finitely generated $A$-module and let $(\mathbb{F}, \partial)$ be a minimal free resolution of $M$. Then we prove that $ord(\partial_i) \leq ord_Q(f_1) - 1$ for all $i \gg 0$. We also construct an MCM $A$-module $M$ such that $ord(\partial_{2i+1}) = ord_Q(f_1) - 1$ for all $i \geq 0$. We also give a considerably simpler proof regarding the periodicity of ideals of minors of maps in a minimal free resolution of modules over arbitrary complete intersection rings (not necessarily strict).
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