Characterizations of Buchsbaum complexes
Characterizations of Buchsbaum complexes
复制标题
Buchsbaum 配合物的表征
DOI:
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发表时间:
1989
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通讯作者:
Mitsuhiro Miyazaki
中科院分区:
文献类型:
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作者:
Mitsuhiro Miyazaki
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.