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David Sumner

David P. Sumner is an American mathematician known for his research in graph theory. He formulated Sumner's conjecture that tournaments are universal graphs for polytrees in 1971, and showed in 1974 that all claw-free graphs with an even number of vertices have perfect matchings. He and András Gyárfás independently formulated the Gyárfás–Sumner…

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David Sumner

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sumner david formulated conjecture graphs university tournaments polytrees tree χ-bounded american mathematician known research graph theory sumner's universal 1971 showed

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