On the minimum number of eigenvalues of matrices associated with cographs

Luiz Emilio Allem, Martin Fürer, Carlos Hoppen +2

A symmetric matrix $M=(m_{ij})\in {\mathbb{R}}^{n\times n}$ is said to be associated with an $n$-vertex graph $G=(V,E)$ with vertex set $\{v_1,\dots ,v_n\}$ if, for every $i \neq j…