arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2107.04539math.ACmath.CO
收藏

$(S_2)$ -条件与Cohen-Macaulay二项式边理想

$(S_2)$-condition and Cohen-Macaulay binomial edge ideals

Alberto Lerda, Carla Mascia, Giancarlo Rinaldo, Francesco Romeo

摘要:

我们描述了单纯复形$Δ$,使得$J_G$的初始理想是$Δ$的Stanley-Reisner理想。通过$Δ$,我们表明,如果$J_G$是$(S_2)$,则$G$是可访问的。我们还刻画了所有可访问的块与胡须的圈秩3,我们定义了一个新的无限类的可访问的块与胡须的任何圈秩。最后,通过计算方法,我们证明了最多12个顶点的二项式边理想是Cohen-Macaulay的图是所有且唯一的可达图。

英文摘要:

We describe the simplicial complex $Δ$ such that the initial ideal of $J_G$ is the Stanley-Reisner ideal of $Δ$. By $Δ$ we show that if $J_G$ is $(S_2)$ then $G$ is accessible. We also characterize all accessible blocks with whiskers of cycle rank 3 and we define a new infinite class of accessible blocks with whiskers for any cycle rank. Finally, by using a computational approach, we show that the graphs with at most 12 vertices whose binomial edge ideal is Cohen-Macaulay are all and only the accessible ones.

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。

↑