3-bounded property in a triangle-free distance-regular graph

Abstract

Let $\Gamma$ denote a distance-regular graph with classical parameters $(D,b,\alpha ,\beta )$ and $D\ge 3$. Assume the intersection numbers $a_1=0$ and $a_2\ne 0$. We show $\Gamma$ is 3-bounded in the sense of the article [D-bounded distance-regular graphs, European Journal of Combinatorics(1997)18, 211-229].

13 pages