Regular Article
On Distance-Regular Graphs with ki = kj

https://doi.org/10.1006/jctb.1994.1035Get rights and content
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Abstract

Let Γ be a distance-regular graph with diameter d. We show that if ki = kj with i < j and i + jd, then Γ is either an antipodal two-cover or ki = ki + l = ... = kj.

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