Jianfeng Wang

most citedOpen problems in the spectral theory of signed graphs

6 citations · 11 across the 3 of their papers we have counts for

collaborators

3 papers

math.CO2019★ 6 cited

Open problems in the spectral theory of signed graphs

Francesco Belardo, Sebastian M. Cioabă, Jack H. Koolen +1

Signed graphs are graphs whose edges get a sign $+ 1$ or $- 1$ (the signature). Signed graphs can be studied by means of graph matrices extended to signed graphs in a natural way. Re…

math.CO2014

On a Problem of Harary and Schwenk on Graphs with Distinct Eigenvalues

Xueliang Li, Jianfeng Wang, Qiongxiang Huang

Harary and Schwenk posed the problem forty years ago: Which graphs have distinct adjacency eigenvalues? In this paper, we obtain a necessary and sufficient condition for an Hermiti…

math.CO2014★ 5 cited

Randić energy and Randić eigenvalues

Xueliang Li, Jianfeng Wang

Let $G$ be a graph of order $n$ , and $d_{i}$ the degree of a vertex $v_{i}$ of $G$ . The Randić matrix $R = (r_{ij})$ of $G$ is defined by $r_{ij} = 1/ d_{j} d_{j}$ if the vertic…