Graphs with large obstacle numbers
WG'10 Proceedings of the 36th international conference on Graph-theoretic concepts in computer science
Unsolved problems in visibility graphs of points, segments, and polygons
ACM Computing Surveys (CSUR)
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For a finite set P in the plane, let b(P) be the smallest possible size of a set Q, Q∩P=∅, such that every segment with both endpoints in P contains at least one point of Q. We raise the problem of estimating b(n), the minimum of b(P) over all n-point sets P with no three points collinear. We review results providing bounds on b(n) and mention some additional observations.