Double Covers of Symplectic Dual Polar Graphs

G. Eric Moorhouse, Jason Williford

Let $\Gamma =\Gamma (2n,q)$ be the dual polar graph of type $Sp(2n,q)$. Underlying this graph is a $2n$-dimensional vector space $V$ over a field ${\mathbb{F}}_q$ of odd order $q$, together wit…