Almost-bipartite distance-regular graphs with the $Q$-polynomial property

Details Almost-bipartite distance-regular graphs with the $Q$-polynomial property Almost-bipartite distance-regular graphs with the $Q$-polynomial property

2005-08-23

arxiv.org/abs/math/0508435v1

Mathematics

Combinatorics

8 pages

Scientific paper

Let $G$ denote a $Q$-polynomial distance-regular graph with diameter $D$ at
least 4. Assume that the intersection numbers of $G$ satisfy $a_i=0$ for $0
\leq i \leq D-1$ and $a_D\neq 0$. We show that $G$ is a polygon, a folded cube,
or an Odd graph.

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