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arXiv 1302.7076math.ACmath.CO
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边理想二次幂Cohen-Macaulay性的组合刻画

Combinatorial characterizations of the Cohen-Macaulayness of the second power of edge ideals

Do Trong Hoang, Nguyen Cong Minh, Tran Nam Trung

摘要:

设$I(G)$是单图$G$的边理想.本文给出了$G$的边理想的第二个符号幂和第二个普通幂分别为Cohen-Macaulay的组合的充要条件. Buchsbaum,generalized Cohen-Macaulay).作为我们结果的一个应用,我们将分类所有的二部图,其中第二(符号)权力是科恩-麦考利(分别。Buchsbaum,generalized Cohen-Macaulay).

英文摘要:

Let $I(G)$ be the edge ideal of a simple graph $G$. In this paper, we will give sufficient and necessary combinatorial conditions of $G$ in which the second symbolic and ordinary power of its edge ideal are Cohen-Macaulay (resp. Buchsbaum, generalized Cohen-Macaulay). As an application of our results, we will classify all bipartite graphs in which the second (symbolic) powers are Cohen-Macaulay (resp. Buchsbaum, generalized Cohen-Macaulay).

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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