4ct-non-counterexample.png (494 × 491 pixels, file size: 7 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:48, 26 April 2006 | ![]() | 494 × 491 (7 KB) | Syp | It is necessary to change the colour of at least four of the ten regions of this map to obtain a proper four-colouring. copied from en:Image:4ct-non-counterexample.png |
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