Ligong Wang

activity

20162023

most citedThe rank of a complex unit gain graph in terms of the rank of its underlying graph

1 citations · 2 across the 13 of their papers we have counts for

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23 papers · 1 filter

math.CO2023

Fractional revival on semi-Cayley graphs over abelian groups

Jing Wang, Ligong Wang, Xiaogang Liu

In this paper, we investigate the existence of fractional revival on semi-Cayley graphs over finite abelian groups. We give some necessary and sufficient conditions for semi-Cayley…

math.CO2023

Sharp bounds for Laplacian spectral moments of digraphs with a fixed dichromatic number

Xiuwen Yang, Hajo Broersma, Ligong Wang

The $k$ -th Laplacian spectral moment of a digraph $G$ is defined as $\sum_{i = 1}^{n} λ_{i}^{k}$ , where $λ_{i}$ are the eigenvalues of the Laplacian matrix of $G$ and $k$ is a nonnegative in…

math.CO2023★ 1 cited

The sufficient conditions for $k$ -leaf-connected graphs in terms of several topological indices

Tingyan Ma, Ligong Wang, Yang Hu

Let $G = (V (G), E (G))$ be a graph with vertex set $V (G)$ and edge set $E (G)$ . For $k \geq 2$ and given any subset $S \subseteq ∣ V (G) ∣$ with $∣ S ∣ = k$ , if a graph $G$ of order $|V(G)|\geq k…

math.CO2022

An improvement of sufficient condition for $k$ -leaf-connected graphs

Tingyan Ma, Guoyan Ao, Ruifang Liu +2

For integer $k \geq 2,$ a graph $G$ is called $k$ -leaf-connected if $∣ V (G) ∣ \geq k + 1$ and given any subset $S \subseteq V (G)$ with $∣ S ∣ = k,$ $G$ always has a spanning tree $T$ such that…

math.CO2022

The $A_{α}$ spectral radius with given independence number $n - 4$

Xichan Liu, Ligong Wang

Let $G$ be a graph with adjacency matrix $A (G)$ and degree diagonal matrix $D (G)$ . In 2017, Nikiforov [Appl. Anal. Discrete Math., 11 (2017) 81--107] defined the matrix $A_α(G) =…

math.CO2021

On the $A_{α}$ spectral radius and $A_{α}$ energy of non-strongly connected digraphs

Xiuwen Yang, Ligong Wang

Let $A_{α} (G)$ be the $A_{α}$ -matrix of a digraph $G$ and $λ_{α 1}, λ_{α 2}, \dots, λ_{α n}$ be the eigenvalues of $A_{α} (G)$ . Let $ρ_{α} (G)$ be the $A_{α}$ spectral radius of $G$ and $E_α(G)=…

Fractional revival on semi-Cayley graphs over abelian groups

Sharp bounds for Laplacian spectral moments of digraphs with a fixed dichromatic number

The sufficient conditions for k-leaf-connected graphs in terms of several topological indices

An improvement of sufficient condition for k-leaf-connected graphs

The Aα​ spectral radius with given independence number n−4

On the Aα​ spectral radius and Aα​ energy of non-strongly connected digraphs

The sufficient conditions for $k$ -leaf-connected graphs in terms of several topological indices

An improvement of sufficient condition for $k$ -leaf-connected graphs

The $A_{α}$ spectral radius with given independence number $n - 4$

On the $A_{α}$ spectral radius and $A_{α}$ energy of non-strongly connected digraphs