Chang-Xiang He

collaborators

2 papers

math.CO2025

Extremal graphs for the sum of the first two largest signless Laplacian eigenvalues

Zi-Ming Zhou, Zhi-Bin Du, Chang-Xiang He

For a graph $G$ , let $S_{2} (G)$ be the sum of the first two largest signless Laplacian eigenvalues of $G$ , and $f (G) = e (G) + 3 - S_{2} (G)$ . Very recently, Zhou, He and Shan proved that $K^+…

math.CO2024

On the sum of the first two largest signless Laplacian eigenvalues of a graph

Zi-Ming Zhou, Chang-Xiang He, Hai-Ying Shan

For a graph $G$ , let $S_{2} (G)$ be the sum of the first two largest signless Laplacian eigenvalues of $G$ , and $f (G) = e (G) + 3 - S_{2} (G)$ . Oliveira, Lima, Rama and Carvalho conjectured tha…