A Note on a Construction by Pavese and Smaldore

Abstract

Recently, Pavese and Smaldore constructed graphs cospectral to $NU(5,q^2)$ for $q>2$. We show that their construction works for $NU(n,q^2)$, $n\ge 5$. Hence, none of the graphs $NU(n,q^2)$, $n\ge 5$, are determined by their spectrum.

Merged with arXiv:2012.10651 [math.CO]