Regular graphs with a complete bipartite graph as a star complement

Xiaona Fang, Lihua You, Rangwei Wu +1

Let $G$ be a graph of order $n$ and $\mu$ be an adjacency eigenvalue of $G$ with multiplicity $k\ge 1$. A star complement $H$ for $\mu$ in $G$ is an induced subgraph of $G$ of order $…