Qi Kong

collaborators

3 papers

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 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