最小度至少为2的图的正平方能量
Positive Square Energy of Graphs with Minimum Degree at Least Two
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- Sharif University of Technology(谢里夫理工大学)
- Anhui University(安徽大学)
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中文总结 AI 辅助
本文针对最小度至少为2的连通图,将平方能量下界从$n-1$加强到$n$,除非该图是圈。
中文摘要 AI 辅助
设$s^+(G)$表示图$G$的正邻接特征值的平方和。Elphick、Farber、Goldberg和Wocjan提出的平方能量猜想(由Liu、Tang和Zhang证明)给出了任意$n$阶连通图的下界$n-1$。我们将此下界加强为:对于每个$n$阶且最小度至少为2的连通图$G$,除非$G$是圈,否则$s^+(G)\ge n$。
英文摘要
Let $s^+(G)$ denote the sum of the squares of the positive adjacency eigenvalues of a graph $G$. The square-energy conjecture of Elphick, Farber, Goldberg, and Wocjan, proved by Liu, Tang, and Zhang, gives a lower bound of $n-1$ for any connected graph of order $n$. We strengthen this bound to $s^+(G)\ge n$ for every connected graph $G$ of order $n$ with minimum degree at least two, unless $G$ is a cycle.