Crossing Minimization for Symmetries
Buchheim, Christoph and Hong, Seok-Hee (2005) Crossing Minimization for Symmetries. [Journal (Paginated)]
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We consider the problem of drawing a graph with a given symmetry such that the number of edge crossings is minimal. We show that this problem is NP-hard, even if the order of orbits around the rotation center or along the reflection axis is fixed. We devise an $O(m\log m)$ algorithm for computing a crossing minimal drawing if inter-orbit edges may not cross orbits, showing in particular that intra-orbit edges do not contribute to the NP-hardness of the crossing minimization problem for symmetries.
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