arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.13059math.CO
收藏

随机图的度距离矩阵的四种Laplacian型能量的渐近值

Asymptotic values of four Laplacian-type energies for matrices with degree-distance-based entries of random graphs

Xueliang Li, Yiyang Li, Zhiqian Wang

摘要:

设$f(D(i, j), d_i, d_j)$是一个在$i$和$j$中对称的实函数,其性质是$f(d, (1+o(1))np, (1+o(1))np)=(1+o(1))f(d, np, np)$对$d=1,2$ .设$G$是一个图,$d_i$表示$G$中顶点$i$的度,$D(i, j)$表示$G$中顶点$i$和$j$之间的距离.本文定义了Erd $\ddot{o}$ s-R $\acute{e}$ nyi随机图模型$\mathcal{G}_{n, p}$中随机图的$f$加权Laplacian矩阵,其中$p\in (0, 1)$是固定的.引入并研究了四种加权Laplacian型能量:加权Laplacian能量$\mathscr{LE}_f(G)$、加权无符号Laplacian能量$\mathscr{LE}^{+}_f(G)$、加权入射能量$\mathscr{IE}_f(G)$和加权类Laplacian能量不变量$\mathscr{LEL}_f(G)$.在$f(D(i, j), d_i, d_j)$是只依赖于$D(i, j)$的函数的条件下,我们得到了$\mathscr{IE}_f(G)$和$\mathscr{LEL}_f(G)$的渐近值,以及$\mathscr{LE}_f(G)$和$\mathscr{LE}_f^{+}(G)$的值.由此,我们得到了对于几乎所有的图$G_p\in \mathcal{G}_{n, p}$,$G_p$的元素以度距离为基础的矩阵的能量,$\mathscr{E}(W_f(G_p)) < \mathscr{LE}_f(G_p),$是矩阵的Laplacian能量,这是Gutman等人猜想的推广.

英文摘要:

Let $f(D(i, j), d_i, d_j)$ be a real function symmetric in $i$ and $j$ with the property that $f(d, (1+o(1))np, (1+o(1))np)=(1+o(1))f(d, np, np)$ for $d=1,2$. Let $G$ be a graph, $d_i$ denote the degree of a vertex $i$ of $G$ and $D(i, j)$ denote the distance between vertices $i$ and $j$ in $G$. In this paper, we define the $f$-weighted Laplacian matrix for random graphs in the Erd$\ddot{o}$s-R$\acute{e}$nyi random graph model $\mathcal{G}_{n, p}$, where $p\in (0, 1)$ is fixed. Four weighted Laplacian type energies: the weighted Laplacian energy $\mathscr{LE}_f(G)$, weighted signless Laplacian energy $\mathscr{LE}^{+}_f(G)$, weighted incidence energy $\mathscr{IE}_f(G)$ and the weighted Laplacian-energy like invariant $\mathscr{LEL}_f(G)$ are introduced and studied. We obtain the asymptotic values of $\mathscr{IE}_f(G)$ and $\mathscr{LEL}_f(G)$, and the values of $\mathscr{LE}_f(G)$ and $\mathscr{LE}_f^{+}(G)$ under the condition that $f(D(i, j), d_i, d_j)$ is a function dependent only on $D(i, j)$. As a consequence, we get that for almost all graphs $G_p\in \mathcal{G}_{n, p}$, the energy for the matrix with degree-distance-based entries of $G_p$, $\mathscr{E}(W_f(G_p)) < \mathscr{LE}_f(G_p),$ the Laplacian energy of the matrix, which is a generalization of a conjecture by Gutman et al.

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。

↑