Regular Article
Bipartite Distance-Regular Graphs with an Eigenvalue of Multiplicity \itk\rm

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Abstract

We show that, if a bipartite distance-regular graph of valencykhas an eigenvalue of multiplicityk, then it becomes 2-homogeneous. Combined with a result on bipartite 2-homogeneous distance-regular graphs by K. Nomura, we have a classification of such graphs.

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