Signless Laplacian eigenvalue problems of Nordhaus-Gaddum type

Xueyi Huang, Huiqiu Lin

Let $G$ be a graph of order $n$, and let $q_1(G)\ge q_2(G)\ge \cdots \ge q_n(G)$ denote the signless Laplacian eigenvalues of $G$. Ashraf and Tayfeh-Rezaie [Electron. J. Combin. 2…