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arXiv 1105.4820math.CO
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完全k-一致超图的循环染色复形

The cyclic coloring complex of a complete k-uniform hypergraph

Sarah Crown Rundell

摘要:

本文研究了三种不同类型的$k$ -一致超图的循环染色复形的同调性。对于完全$k$ -一致超图,我们证明了$(n-k-1)^{st}$同调群的维数由一个二项式系数给出。进一步,我们讨论了一个复形,它的$r$ -面由所有有序集划分$[B_1, ..., B_{r+2}]$组成,其中没有一个$B_i$包含完全$k$ -一致超图$H$的超边,并且其中$1 \in B_1$ .证明了该复形的同调群的维数由二项式系数给出。因此,这个结果给出了$\C[x_1,...,x_n]/ \{x_{i_1}...x_{i_k} \mid i_{1}...i_{k}$的循环同调群的多线性部分的维数是$H \}$的超边.对于另外两类超图,即星超图和对角超图,我们证明了它们的循环染色复形的同调群的维数也由二项式系数给出。

英文摘要:

In this paper, we study the homology of the cyclic coloring complex of three different types of $k$-uniform hypergraphs. For the case of a complete $k$-uniform hypergraph, we show that the dimension of the $(n-k-1)^{st}$ homology group is given by a binomial coefficient. Further, we discuss a complex whose $r$-faces consist of all ordered set partitions $[B_1, ..., B_{r+2}]$ where none of the $B_i$ contain a hyperedge of the complete $k$-uniform hypergraph $H$ and where $1 \in B_1$. It is shown that the dimensions of the homology groups of this complex are given by binomial coefficients. As a consequence, this result gives the dimensions of the multilinear parts of the cyclic homology groups of $\C[x_1,...,x_n]/ \{x_{i_1}...x_{i_k} \mid i_{1}...i_{k}$ is a hyperedge of $H \}$. For the other two types of hypergraphs, star hypergraphs and diagonal hypergraphs, we show that the dimensions of the homology groups of their cyclic coloring complexes are given by binomial coefficients as well.

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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