File:4ct-non-counterexample.png

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4ct-non-counterexample.png(494 × 491 pixels, file size: 7 KB, MIME type: image/png)

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Summary

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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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Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
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I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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Date/TimeThumbnailDimensionsUserComment
current10:48, 26 April 2006Thumbnail for version as of 10:48, 26 April 2006494 × 491 (7 KB)Syp (talk | contribs)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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