The nucleus of the Johnson graph $J(N,D)$

Kazumasa Nomura, Paul Terwilliger

In this paper, we describe the nucleus of the Johnson graph $\Gamma =J(N,D)$ with $N>2D$. Let $X$ denote the vertex set of $\Gamma$. Let $A\in {\text{Mat}}_X(\mathbb{C})$ denote the adjace…