Dijian Wang

activity

20182026

most citedUnicyclic signed graphs with maximal energy

1 citations · 1 across the 5 of their papers we have counts for

collaborators

5 papers

math.CO2026

Minimizing the number of edges in $C_{[4, 6]}$ -saturated graphs

Qi Liu, Dijian Wang, Shicai Gong

Let $C_{[4, r]}$ be the family of cycles ${C_{4}, \dots, C_{r}}$ . A graph $G$ is said to be $C_{[4, r]}$ -saturated if $G$ does not contain a copy of cycle $C_{i}$ for…

math.CO2022

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 $G ˙$ is a connected unbalanced signed graph of order $n$ with $e (G ˙)$ edges and $e^-(\dot…

math.CO2022

Hermitian adjacency matrices of mixed multigraphs

Bo-Jun Yuan, Shaowei Sun, Dijian Wang

A mixed multigraph is obtained from an undirected multigraph by orienting a subset of its edges. In this paper, we study a new Hermitian matrix representation of mixed multigraphs,…

math.CO2022

On signed graphs whose spectral radius does not exceed $2 + 5$

Dijian Wang, Wenkuan Dong, Yaoping Hou +1

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…

math.CO2018★ 1 cited

Unicyclic signed graphs with maximal energy

Dijian Wang, Yaoping Hou

Let $x_{1}, x_{2}, \dots, x_{n}$ be the eigenvalues of a signed graph $Γ$ of order $n$ . The energy of $Γ$ is defined as $E (Γ) = \sum_{j = 1}^{n} ∣ x_{j} ∣.$ Let $P_{n}^{4}$ be obtained by c…

Minimizing the number of edges in C[4,6]​-saturated graphs

Extremed signed graphs for triangle

Hermitian adjacency matrices of mixed multigraphs

On signed graphs whose spectral radius does not exceed 2+5​​

Unicyclic signed graphs with maximal energy

Minimizing the number of edges in $C_{[4, 6]}$ -saturated graphs

On signed graphs whose spectral radius does not exceed $2 + 5$