A lower bound of the least signless Laplacian eigenvalue of a graph

Shu-Guang Guo, Yong-Gao Chen, Guanglong Yu

Let $G$ be a simple connected graph on $n$ vertices and $m$ edges. In [Linear Algebra Appl. 435 (2011) 2570-2584], Lima et al. posed the following conjecture on the least eigenvalu…