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Results tagged with planar-graphs
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user 384338
graphs that can be embedded into the plane, i.e. that can be drawn without crossings between the lines representing edges.
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Does every $4$-connected nonplanar graph contain a $K_5$-minor?
By Kuratowski's theorem, every nonplanar graph contains a (topological) minor of $K_5$ or $K_{3,3}$.
But I observed that every time I construct a $4$-connected nonplanar graph, it always contains not …
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