Smith’s Theorem and a characterization of the 6-cube as distance-transitive graph |
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Authors: | M R Alfuraidan J I Hall |
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Institution: | (1) Department of Mathematical Sciences, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia;(2) Department of Mathematics, Michigan State University, East Lansing, Michigan 48824, USA |
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Abstract: | A generic distance-regular graph is primitive of diameter at least two and valency at least three. We give a version of Derek Smith's famous theorem for reducing the classification of distance-regular graphs to that of primitive graphs. There are twelve cases—the generic case, four canonical imprimitive cases that reduce to the generic case, and seven exceptional cases. All distance-transitive graphs were previously known in six of the seven exceptional cases. We prove that the 6-cube is the only distance-transitive graph coming under the remaining exceptional case. |
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Keywords: | Imprimitive distance-transitive graph Imprimitive distance-regular graph |
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