File:Hadwiger conjecture.svg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:47, 25 May 2008 | ![]() | 630 × 630 (3 KB) | David Eppstein | {{Information |Description=A graph ''G'' that requires four colors in any coloring, and four connected subsets of vertices that, when contracted, form a ''K''<sub>4</sub> minor of ''G'', illustrating the case ''k'' = 4 of [[: |
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