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There seems to be a problem with the article: the example shown is with colouring the map. But showing two adjacent regions to have different colours proves not
by plank 2y ago
There seems to be a problem with the article: the example shown is with colouring the map. But showing two adjacent regions to have different colours proves nothing: they will always be different (if colouring is possible).
Perhaps if one shows two regions that do not share a border, and state that they are or are not the same colour...
- kevinwang 2y agoI think the example is fine. Two adjacent regions will indeed always be different if the coloring is correct. But it may not be if the coloring is incorrect.