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arXiv 0707.4451math.AC
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短局部环上的自由分解

Free resolutions over short local rings

Luchezar L. Avramov, Srikanth B. Iyengar, Liana M. Sega

摘要:

研究了交换局部环(R,m,k)上有限模M的极小自由分解的结构,其中m^3=0且rank_k(m^2)< rank_k(m/m^2).证明了在一般R上每个M都有一个Koszul合冲模.明确的家庭Koszul模块被确定。当R是Gorenstein时,非Koszul模被分类。建立了分次k-代数Ext_R(k,k)及其分次模Ext_R(M,k)的结构定理.

英文摘要:

The structure of minimal free resolutions of finite modules M over commutative local rings (R,m,k) with m^3=0 and rank_k(m^2) < rank_k(m/m^2)is studied. It is proved that over generic R every M has a Koszul syzygy module. Explicit families of Koszul modules are identified. When R is Gorenstein the non-Koszul modules are classified. Structure theorems are established for the graded k-algebra Ext_R(k,k) and its graded module Ext_R(M,k).

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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