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arXiv math/0606413math.AC
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作为Hilbert-Samuel多重性的Buchsbaum-Rim多重性

Buchsbaum-Rim Multiplicities as Hilbert-Samuel Multiplicities

C-Y. Jean Chan, Jung-Chen Liu, Bernd Ulrich

摘要:

研究了具有极大理想m的正则2维局部环上有限长有限生成模M在自由模F中的Buchsbaum-Rim重数.首先,我们利用联系理论研究了m-准素理想的色长及其Hilbert-Samuel重数。作为应用,我们建立了几个表示M的Buchsbaum-Rim重数的重数公式,这些重数是用与M的某个极小约化U有关的理想的Hilbert-Samuel重数表示的.此外,分别存在模F和M的m-准素Bourbaki理想I和J,使得F/M同构于I/J。后一部分是有关的图形解释的多重性的情况下,单项理想。

英文摘要:

Over a regular local ring of dimension two with maximal ideal m, we study the Buchsbaum-Rim multiplicity of a finitely generated module M of finite colength in a free module F. First, we investigate the colength of an m-primary ideal and its Hilbert-Samuel multiplicity using linkage theory. As applications, we establish several multiplicity formula that express the Buchsbaum-Rim multiplicity of M in terms of the Hilbert-Samuel multiplicities of ideals related to a certain minimal reduction U of M. Moreover, there exists m-primary Bourbaki ideals I and J of the modules F and M respectively such that F/M is isomorphic to I/J. We also have a formula for the Buchsbaum-Rim multiplicity whenever such I and J are given. The latter part is related to a graphical interpretation of the multiplicities in the case of monomial ideals.

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