Tails of Bipartite Distance-regular Grap
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Michael S. Lang
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Article
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2002
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Elsevier Science
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English
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Let denote a bipartite distance-regular graph with diameter D โฅ 4 and valency k โฅ 3. Let ฮธ 0 > ฮธ 1 > โข โข โข > ฮธ D denote the eigenvalues of and let E 0 , E 1 , . . . , E D denote the associated primitive idempotents. Fix s (1 โค s โค D -1) and abbreviate E := E s . We say E is a tail whenever the entry