Publication

Lower bounds on the obstacle number of graphs

János Pach, Doemoetoer Palvoelgyi
2012
Journal Articles

Abstract

Given a graph G, an obstacle representation of G is a set of points in the plane representing the vertices of G, together with a set of connected obstacles such that two vertices of G are joined by an edge if and only if the corresponding points can be connected by a segment which avoids all obstacles. The obstacle number of G is the minimum number of obstacles in an obstacle representation of G. It is shown that there are graphs on n vertices with obstacle number at least Omega(n/logn).

Official source

https://infoscience.epfl.ch/entities/publication/b6a625a3-6fcb-4b8f-a9d9-f39217ebec93

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Lower bounds on the obstacle number of graphs

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