Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Li, Deqiong"'
Autor:
Li, Deqiong, Huang, Qiongxiang
It is well known that a graph $G$ has a symmetric spectrum if and only if it is bipar?tite, a signed graph $\Gamma=(G,\sigma)$ has a symmetric spectrum if $G$ is bipartite. However, there exists a spectrally symmetric signed graph $\Gamma=(G,\sigma)$
Externí odkaz:
http://arxiv.org/abs/2304.06864
In this paper, we study the Tur\'{a}n problem of signed graphs version. Suppose that $\dot{G}$ is a connected unbalanced signed graph of order $n$ with $e(\dot{G})$ edges and $e^-(\dot{G})$ negative edges, and let $\rho(\dot{G})$ be the spectral radi
Externí odkaz:
http://arxiv.org/abs/2212.11460
The Hoffman program with respect to any real or complex square matrix $M$ associated to a graph $G$ stems from Hoffman's pioneering work on the limit points for the spectral radius of adjacency matrices of graphs does not exceed $\sqrt{2+\sqrt{5}}$.
Externí odkaz:
http://arxiv.org/abs/2203.01530
Publikováno v:
In Linear Algebra and Its Applications 15 January 2024 681:47-65
Publikováno v:
In Discrete Mathematics June 2023 346(6)
Autor:
Nie, Guozheng, Tan, Diwen, Li, Deqiong, Li, Zonglin, Zhong, Fang, Chen, Zhiquan, Zhan, Shiping, Liu, Yunxin
Publikováno v:
In Journal of Alloys and Compounds 25 March 2023 938
In this paper, all graphs whose adjacency matrix has at most two eigenvalues (multiplicities included) different from $2$ and $-1$ are determined. These graphs conclude a class of generalized friendship graphs $F_{t,r,k}, $ which is the graph of $k$
Externí odkaz:
http://arxiv.org/abs/1806.07260
Akademický článek
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Publikováno v:
In Discrete Mathematics December 2021 344(12)
Publikováno v:
In Linear Algebra and Its Applications 15 April 2020 591:134-153