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

Kazumasa Nomura, Paul Terwilliger

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