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English: A graph illustrating Ore's theorem, that when all pairs of nonadjacent vertices have degrees summing to at least n, the graph has a Hamiltonian cycle. Here, the two degree-three vertices in the center are adjacent, and all other pairs of vertices have degrees summing to at least seven, the number of vertices. Because some vertices have fewer than n/2 neighbors, the conditions for the weaker Dirac theorem on Hamiltonian cycles are not met. A Hamiltonian cycle is highlighted.
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Source Own work
Author David Eppstein

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Example of Ore's theorem

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13 January 2019

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Date/TimeThumbnailDimensionsUserComment
current05:36, 14 January 2019Thumbnail for version as of 05:36, 14 January 2019306 × 252 (679 bytes)David EppsteinUser created page with UploadWizard

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