Ligong Wang

activity

20152023

most citedOrdering of bicyclic graphs by matching energy

7 citations · 33 across the 43 of their papers we have counts for

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Showing 2022Show all

6 papers · 1 filter

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.CO2022

The $A_{α}$ spectral radius of $k$ -connected graphs with given diameter

Xichan Liu, Ligong Wang

Let $G$ be a graph with adjacency matrix $A (G)$ and degree diagonal matrix $D (G)$ . In 2017, Nikiforov defined the matrix $A_{α} (G) = α D (G) + (1 - α) A (G)$ for any real $α \in [0, 1]$ . The…

math.CO2022

Fractional revival on Cayley graphs over abelian groups

Jing Wang, Ligong Wang, Xiaogang Liu

In this paper, we investigate the existence of fractional revival on Cayley graphs over finite abelian groups. We give a necessary and sufficient condition for Cayley graphs over f…

math.CO2022

Signless Laplacian Estrada index and Laplacian Estrada index of uniform hypergraphs

Cunxiang Duan, Edwin R. van Dam, Ligong Wang

We generalize the notions of Laplacian and signless Laplacian Estrada index to uniform hypergraphs. For an $r$ -uniform hypergraph $H,$ we derive an order $r + 1$ trace formula of the…

math.CO2022

Linear Turán numbers of acyclic quadruple systems

Lin-Peng Zhang, Ligong Wang

A linear $r$ -uniform hypergraph is called acycilc if it can be constructed starting from one single edge then at each step adding a new edge that intersect the union of the vertice…

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

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

The Aα​ spectral radius of k-connected graphs with given diameter

Fractional revival on Cayley graphs over abelian groups

Signless Laplacian Estrada index and Laplacian Estrada index of uniform hypergraphs

Linear Turán numbers of acyclic quadruple systems

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

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

The $A_{α}$ spectral radius of $k$ -connected graphs with given diameter