The Buchsbaum–Rim Polynomial of a Module☆

The Buchsbaum–Rim Polynomial of a Module☆
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模的 Buchsbaum–Rim 多项式☆

DOI:
10.1006/jabr.2001.8764
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发表时间:
2001
期刊:
影响因子:
0.9
通讯作者:
W. Vasconcelos
W. Vasconcelos
中科院分区:
数学3区
文献类型:
--
作者:
J. Brennan;B. Ulrich;W. Vasconcelos

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对于Noether局部环(R,m),m -准素理想的Hilbert函数提供了关于理想的构造和奇性编码的大量信息。对于一个模E这是类似的理想(E是一个正常的子模的自由模,使商有有限的长度),Buchsbaum和边缘定义了一个类似的功能,并介绍了概念Buchsbaum-Rim多重br(E)的模块。与理想情况不同,关于这些函数的信息仍然很少。当R是维数d > 1的Cohen-Macaulay且E有秩r时,我们充分地发展了它们的一些性质,以建立模E的约化数的如下界:r(E)≤(d + r − 1)·(br(E)− 2)+ 1。同样的技术导致的限制的发电机的整体封闭的权力,某些理想和模块。
Abstract For a Noetherian local ring (R,  m ), the Hilbert functions of m -primary ideals provide considerable information about constructions and singularities coded by the ideal. For a module E which is the analogue of such ideals (E is a proper submodule of a free module so that the quotient has finite length), Buchsbaum and Rim defined a similar function and introduced the notion of Buchsbaum–Rim multiplicity br(E) of the module. Unlike in the ideal case, the information about these functions is still scant. When R is Cohen–Macaulay of dimension d > 1 and E has rank r, we develop some of their properties sufficiently enough to establish the following bound for the reduction number of the module E, r(E) ≤ (d + r − 1) · (br(E) − 2) + 1. The same techniques lead to bounds on the number of generators of the integral closure of the powers of certain ideals and modules.
DOI: --
发表时间: 2006
期刊: Integrable systems, geometry, and topology, AMS/IP Studies of Advanced Mathematics, American Mathematical Society 36
影响因子: --
作者:
FURUYA;Jun;Martin Guest
通讯作者: Martin Guest