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arXiv 2104.08476math.CO
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森林的Laplacian系数与其线图的闭游动数

Laplacian Coefficients of a Forest in terms of the Number of Closed Walks in the Forest and its Line Graph

Ali Ghalavand, Ali Reza Ashrafi

摘要:

设$G$是具有拉普拉斯多项式$ψ(G,λ)=\sum_{k=0}^n(-1)^{n-k}c_kλ^k$的有限单图.在较早的论文中,系数$c_{n-4}$和$c_{n-5}$的树关于一些度为基础的图不变量计算。本文的目的是继续这项工作,给出一个精确的公式系数$c_{n-6}$。作为这项工作的结果,拉普拉斯系数$c_{n-k}$的森林$F$,$1\leq k \leq 6$,计算在封闭的行走在$F$和它的线图的数量。

英文摘要:

Let $G$ be a finite simple graph with Laplacian polynomial $ψ(G,λ)=\sum_{k=0}^n(-1)^{n-k}c_kλ^k$. In an earlier paper, the coefficients $c_{n-4}$ and $c_{n-5}$ for tree with respect to some degree-based graph invariants were computed. The aim of this paper is to continue this work by giving an exact formula for the coefficients $c_{n-6}$. As a consequence of this work, the Laplacian coefficients $c_{n-k}$ of a forest $F$, $1\leq k \leq 6$, are computed in terms of the number of closed walks in $F$ and its line graph.

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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