Let Γ be a Q-polynomial distance-regular graph of diameter $d\ge 3$. Fix a vertex γ of Γ and consider the subgraph induced on the union of the last two subconstituents of Γ with respect to γ. We prove that this subgraph is connected.

中文翻译：

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关于Q多项式距离正则图的最后两个子成分的连通性

令Γ为直径的Q多项式距离正则图$d\ge 3$。修正了一个顶点γ Γ并考虑对诱导Γ的最后两个次成分的结合相对于子图γ。我们证明该子图是连通的。