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OpenStudy (anonymous):
Let G be a planar graph with no K3 subgraph. Prove G is 4 colourable.
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OpenStudy (anonymous):
K3 is a graph with 3 vertices that are all adjacent to each other.
OpenStudy (anonymous):
What confuses me is wouldn't this be not true for a graph that a graph like that is a counter example I think |dw:1395811041797:dw|
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