“no landlocked” is key....
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Note : graphs corresponding to continents without landlocked countries are called outer planar and have many interesting properties. The 3-coloring can be obtained by decomposing into triangles
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“No inner bodies of water” seems unnecessary and narrows the ability to apply this corollary to the 4-color theorem. Am I missing something?
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So this applies to the states of australia?
- End of conversation
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Please, elaborate further.
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An example with a world map with three colours will be amazing!! Anyone has tried in practice?
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