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arXiv 2202.04756math.CO
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关于线图的双覆盖

On the double covers of a line graph

Shiv Nadar Institution of Eminence(Shiv Nadar卓越机构)

Shivani Chauhan, A. Satyanarayana Reddy

AI总结:

本文研究了线图的三种双覆盖结构,并证明了存在两个非余谱的等能图。

摘要:

设L(X)为图X的线图。令X''为X与K₂的克罗内克积。在本文中,我们看到L(X'')是L(X)的双覆盖。我们定义X的对称边图,记作γ(X),它也是L(X)的双覆盖。我们研究γ(X)与X以及L(X)的三个双覆盖之间的各种性质,这三个双覆盖分别是L(X'')、γ(X)和L(X)''。借助这些双覆盖,我们证明对于任何整数k≥5,存在两个阶数为2k的等能图,它们不是余谱的。

英文摘要:

Let $L(X)$ be the line graph of graph $X$. Let $X^{\prime\prime}$ be the Kronecker product of $X$ by $K_2$. In this paper, we see that $L(X^{\prime\prime})$ is a double cover of $L(X)$. We define the symmetric edge graph of $X$, denoted as $γ(X)$ which is also a double cover of $L(X)$. We study various properties of $γ(X)$ in relation to $X$ and the relationship amongst the three double covers of $L(X)$ that are $L(X^{\prime\prime}),γ(X)$ and $L(X)^{\prime\prime}$. With the help of these double covers, we show that for any integer $k\geq 5$, there exist two equienergetic graphs of order $2k$ that are not cospectral.

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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