Q. Kong

collaborators

4 papers

math.GR2017

On vanishing criteria that control finite group structure II

Julian Brough, Qingjun Kong

In a paper by the first author it was shown that for certain arithmetical results on conjugacy class sizes it is enough to only consider the vanishing conjugacy class sizes. In thi…

math.CO2016

On the signless Laplacian spectral radius of $C_{4}$ -free $k$ -cyclic graphs

Qi Kong, Ligong Wang

A $k$ -cyclic graph is a connected graph of order $n$ and size $n + k - 1$ . In this paper, we determine the maximal signless Laplacian spectral radius and the corresponding extremal gra…

math.CO2016

Upper bounds on the Q-spectral radius of book-free and/or $K_{s, t}$ -free graphs

Qi Kong, Ligong Wang

In this paper, we prove two results about the signless Laplacian spectral radius $q (G)$ of a graph $G$ of order $n$ with maximum degree $Δ$ . Let $B_{n} = K_{2} + K_{n}$ deno…

math.CO2016

The signless Laplacian spectral radius of subgraphs of regular graphs

Qi Kong, Ligong Wang

Let $q (H)$ be the signless Laplacian spectral radius of a graph $H$ . In this paper, we prove that \\1. Let $H$ be a proper subgraph of a $Δ$ -regular graph $G$ with $n$ vertices and…

On vanishing criteria that control finite group structure II

On the signless Laplacian spectral radius of C4​-free k-cyclic graphs

Upper bounds on the Q-spectral radius of book-free and/or Ks,t​-free graphs

The signless Laplacian spectral radius of subgraphs of regular graphs

On the signless Laplacian spectral radius of $C_{4}$ -free $k$ -cyclic graphs

Upper bounds on the Q-spectral radius of book-free and/or $K_{s, t}$ -free graphs