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arXiv 2605.03369math.AC
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可接受子图与图的覆盖理想符号幂的深度

Admissible subgraphs and the depth of symbolic powers of cover ideals of graphs

Thai Nguyen University of Sciences(越南国立大学);Institute of Mathematics, VAST(越南科学技术院数学研究所)

Tran Duc Dung, Nguyen Thu Hang, Thanh Vu

AI总结:

本文引入了t-可接受子图的概念,并利用其计算图的覆盖理想t次符号幂的深度,证明了对于循环图C_n,其符号幂的深度公式。

摘要:

设G为一个简单图。我们引入了G的t-可接受子图的概念,并展示如何利用这些子图来计算G的覆盖理想的t次符号幂的深度。作为应用,我们证明了对于所有t≥2和n≥3,有depth(S/J(C_n)^(t)) = n - 1 - floor(tn/(2t+1)),其中S = K[x_1,…,x_n],J(C_n)是n个顶点的循环图的覆盖理想。

英文摘要:

Let $G$ be a simple graph. We introduce the notion of $t$-admissible subgraphs of $G$ and show how to use them to compute the depth of the $t$-th symbolic powers of the cover ideal of $G$. As an application, we prove that \[ \depth\big(S/J(C_n)^{(t)}\big) = n - 1 - \left\lfloor \frac{tn}{2t+1} \right\rfloor \] for all $t \ge 2$ and $n \ge 3$, where $S = K[x_1,\ldots,x_n]$ and $J(C_n)$ is the cover ideal of the cycle on $n$ vertices.

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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