2 papers
math.CO2022
Ordering -indices of graphs: given size and girth
Yarong Hu, Zhenzhen Lou, Qiongxiang Huang
The signless Laplacian matrix in graph spectra theory is a remarkable matrix of graphs, and it is extensively studied by researchers. In 1981, Cvetković pointed directions in…
math.CO2021
Quadratic starlike trees
Yarong Hu, Qiongxiang Huang
In this paper, we introduce the notion of the quadratic graph, that is a graph whose eigenvalues are integral or quadratic algebraic integral, and determine nine infinite families…