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arXiv 1301.0789math.AC
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完全二部图的二项式边理想的代数性质

Algebraic properties of the binomial edge ideal of complete bipartite graph

Peter Schenzel, Sohail Zafar

摘要:

设$J_G$表示连通无向图在$n$顶点上的二项式边理想.这是由多项式环$S= K[x_1,...,x_n,y_1,...,y_n]$中的二项式$x_iy_j - x_jy_i, 1\leq i < j \leq n,$生成的理想,其中$\{i,j\}$是$G$的边。研究了完全二部图$G$的$S/J_G$的算术性质。特别是,我们计算尺寸,深度,Castelnuovo-Mumford插值,希尔伯特函数和它们的多重性。作为主要结果,我们给出了亏模、局部上同调模的定义,并证明了$S/J_G$的最小自由归结的纯性。

英文摘要:

Let $J_G$ denote the binomial edge ideal of a connected undirected graph on $n$ vertices. This is the ideal generated by the binomials $x_iy_j - x_jy_i, 1\leq i < j \leq n,$ in the polynomial ring $S= K[x_1,...,x_n,y_1,...,y_n]$ where $\{i,j\}$ is an edge of $G$. We study the arithmetic properties of $S/J_G$ for $G$, the complete bipartite graph. In particular we compute dimensions, depths, Castelnuovo-Mumford regularities, Hilbert functions and multiplicities of them. As main results we give an explicit description of the modules of deficiencies, the duals of local cohomology modules, and prove the purity of the minimal free resolution of $S/J_G$.

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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