Spectrum of the Unit-Graph on ${\mathrm{Mat}}_3({\mathbb{F}}_q)$

Yeşim Demiroğlu Karabulut, Heriberto Espinosa

In this paper, we investigate the spectrum of the unit-graph of the ring of $3\times 3$ matrices over a finite field ${\mathbb{F}}_q$, which is equivalently the Cayley digraph $ \ma…