On the eigenvalues of some signed graphs

M. Souri, F. Heydari, M. Maghasedi

Let $G$ be a simple graph and $A(G)$ be the adjacency matrix of $G$. The matrix $S(G)=J-I-2A(G)$ is called the Seidel matrix of $G$, where $I$ is an identity matrix and $J$ is…