We study (symmetric) three-class association schemes.The graphs with four distinct eigenvalues which are one of the relations of such a scheme are characterized.We give an overview of most known constructions, and obtain necessary conditions for existence.A list of feasible parameter sets on at most 100 vertices is generated.
|Place of Publication||Tilburg|
|Number of pages||36|
|Publication status||Published - 1997|
|Name||FEW Research Memorandum|
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