On Laplacian like energy of trees

Aleksandar Ilic, Djordje Krtinic, Milovan Ilic

Let $G$ be a simple undirected $n$-vertex graph with the characteristic polynomial of its Laplacian matrix $L(G)$, $\det (\lambda I-L(G))={\sum }_{k=0}^n(-1{)}^k{c}_k{\lambda }^{n-k}$. Laplacia…