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On the Spectral Characterization of Mixed Extensions of $P_{3}$

On the Spectral Characterization of Mixed Extensions of $P_{3}$

A mixed extension of a graph $G$ is a graph $H$ obtained from $G$ by replacing each vertex of $G$ by a clique or a coclique, whilst two vertices in $H$ corresponding to distinct vertices $x$ and $y$ of $G$ are adjacent whenever $x$ and $y$ are adjacent in $G$. …