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Results tagged with planar-graphs
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user 38624
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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Is every graph the center of some other graph?
I'm just copying my comment above, as it seems to answer the question. For any graph $C$ there exists a graph for which this is the center. Introduce two new vertices $A$ and $B$. Connect all the ve …
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