1 citations · 1 across the 4 of their papers we have counts for
4 papers
The signed graphs with symmetric spectra
Deqiong Li, Qiongxiang Huang
It is well known that a graph has a symmetric spectrum if and only if it is bipartite, a signed graph has a symmetric spectrum if is bipartite. However, there exi…
Extremed signed graphs for triangle
Dijian Wang, Yaoping Hou, Deqiong Li
In this paper, we study the Turán problem of signed graphs version. Suppose that is a connected unbalanced signed graph of order with edges and $e^-(\dot…
On signed graphs whose spectral radius does not exceed
Dijian Wang, Wenkuan Dong, Yaoping Hou +1
The Hoffman program with respect to any real or complex square matrix associated to a graph stems from Hoffman's pioneering work on the limit points for the spectral radius…
The graphs with all but two eigenvalues equal to or
Jing Li, Deqiong Li, Yaoping Hou
In this paper, all graphs whose adjacency matrix has at most two eigenvalues (multiplicities included) different from and are determined. These graphs conclude a class of…