On the depth of binomial edge ideals of graphs

Mohammad Rouzbahani Malayeri; Sara Saeedi Madani; Dariush Kiani

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arXiv · 2101.04703

On the depth of binomial edge ideals of graphs

Mohammad Rouzbahani Malayeri·Sara Saeedi Madani·Dariush Kiani

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Abstract

Let $G$ be a graph on the vertex set $[n]$ and $J_G$ the associated binomial edge ideal in the polynomial ring $S=\mathbb{K}[x_1,\ldots,x_n,y_1,\ldots,y_n]$. In this paper we investigate the depth of binomial edge ideals. More precisely, we first establish a combinatorial lower bound for the depth of $S/J_G$ based on some graphical invariants of $G$. Next, we combinatorially characterize all binomial edge ideals $J_G$ with $\mathrm{depth}\hspace{1.2mm}S/J_G=5$. To achieve this goal, we associate a new poset $\mathcal{M}_G$ with the binomial edge ideal of $G$, and then elaborate some topological properties of certain subposets of $\mathcal{M}_G$ in order to compute some local cohomology modules of $S/J_G$.

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Mohammad Rouzbahani Malayeri, Sara Saeedi Madani, Dariush Kiani. 2021-01-12. On the depth of binomial edge ideals of graphs. https://arxiv.org/abs/2101.04703

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