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Questions about the branch of combinatorics called graph theory (not to be used for questions concerning the graph of a function). This tag can be further specialized via using it in combination with more specialized tags such as extremal-graph-theory, spectral-graph-theory, algebraic-graph-theory, topological-graph-theory, random-graphs, graph-colorings and several others.

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What are the common attributes of K5 and K3,3? [closed]

K5 and K3,3 are the basic nonplanar graphs. K5 is as same as K3,3 when respecting planar graph. So I have a question: What are the common attributes of K5 and K3,3? Which functions make f(K5)=f(K3,3) …
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