On the (non-)existence of tight distance-regular graphs: a local approach

Jack H. Koolen, Jae-Ho Lee, Shuang-Dong Li +3

Let $\Gamma$ denote a distance-regular graph with diameter $D\ge 3$. Jurišić and Vidali conjectured that if $\Gamma$ is tight with classical parameters $(D,b,\alpha ,\beta )$, $b\ge 2$, then $\Gamma$ is n…