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Topic: A Graph Theorem Question (4-coloring related)
Replies: 1   Last Post: Nov 7, 2012 8:07 AM

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Posts: 3
Registered: 7/1/11
A Graph Theorem Question (4-coloring related)
Posted: Jul 1, 2011 4:59 PM
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Could Anyone here help me recall the name of a graph theorem? Basically it states like following:

In a 2D planar map, at most 4 regions/countries can be bordered with each other. Namely, you cannot find such 5 regions/countries, among which any one is bordered with all other 4 regions/countries.

Thanks many tons in advance!


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