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DePaul University

2008

Intersection graphs of line segments

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Complexity Of Some Geometric Problems, Marcus Schaefer Oct 2008

Complexity Of Some Geometric Problems, Marcus Schaefer

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We show that recognizing intersection graphs of convex sets has the same complexity as deciding truth in the existential first-order theory of the reals. Comparing this to similar results on the rectilinear crossing number and intersection graphs of line segments, we argue that there is a need to recognize this level of complexity as its own class.