Characterizations of Buchsbaum complexes

Characterizations of Buchsbaum complexes
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Buchsbaum 配合物的表征

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发表时间:
1989
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通讯作者:
Mitsuhiro Miyazaki
Mitsuhiro Miyazaki
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作者:
Mitsuhiro Miyazaki

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设K是域,Δ是具有顶点集的抽象单纯复形 $$V子集q{x_1,...,x_n}$$ 。本文研究了Stanley-Reisner环[Δ]的Ext模Ext1(A/m(L,k[Δ]))的结构,其中a=k[x1,…,xn]和ML=(xl1,…,xln).利用这个结构定理,我们用模ExtAi(A/m1,k[Δ])的长度刻画了K[Δ]的Buchsbaum性。即isk[Δ]是Buchsbaum当且仅当对所有的[Δ],模ExtAi(A/m1,k[Δ])的长度与l无关。
AbstractLetk be a field and Δ an abstract simplicial complex with vertex set $$V subseteq { x_1 ,...,x_n }$$ . In this article we study the structure of the Ext modules Extai(A/m(l,k[Δ]) of the Stanley-Reisner ringk[Δ] whereA=k[x1,...,xn] andml=(xl1,...,xln). Using this structure theorem we give a characterization of Buchsbaumness ofk[Δ] by means of the length of the modules ExtAi(A/ml,k[Δ]). That isk[Δ] is Buchsbaum if and only if for alli<dimk[Δ], the length of the modules ExtAi(A/ml,k[Δ]) is independent ofl.