Zheng-Jiang Xia

collaborators

3 papers

math.CO2026

Sharp upper bounds on the $A_{I^} \pm$ -spectral radius of graphs

Zhen-Mu Hong, Zheng-Jiang Xia, Zhi Qiao

Let $G$ be a simple graph with degree diagonal matrix $D (G)$ and adjacency matrix $A (G)$ . The signless Laplacian matrix of $G$ is defined as $Q (G) = D (G) + A (G)$ . For a real number $Î±…

math.CO2026

Characterization of the structure of $k$ -edge-maximal graphs

Zheng-Jiang Xia, Hong-Jian Lai, Jian Lu +1

Let $I^º^{'} (G)$ be the edge-connectivity of the graph $G$ . The \textit{strength} of $G$ , denoted by $I^º^{'} (G)$ , is the maximum edge-connectivity of its subgraph…

math.CO2026

On the disjunctive domination numbers of the torus grid graphs

Zhi Qiao, Zheng-Jiang Xia, Zhen-Mu Hong

Let $I^ = (V, E)$ be a graph. The disjunctive domination number of $I^$ is the minimum cardinality of a set $S \subseteq V$ such that every vertex not in $S$ is adjacent to a vertex of…

Sharp upper bounds on the AI^​±-spectral radius of graphs

Characterization of the structure of k-edge-maximal graphs

On the disjunctive domination numbers of the torus grid graphs

Sharp upper bounds on the $A_{I^} \pm$ -spectral radius of graphs

Characterization of the structure of $k$ -edge-maximal graphs