Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Monday, July 14, 2008, 12:15 pm

Duration: This information is not available in the database

Location: CAB G51

Speaker: Jiří Matoušek (Charles Univ., Prague)

Blocking visibility for points in general position

This talk concerns a problem I posed at GWOP 2007. For a finite set P in the plane, let b(P) be the smallest possible size of a set Q disjoint from P and such that every segment with both endpoints in P contains at least one point of Q. We consider the problem of estimating b(n), the minimum of b(P) over all n-point sets P in the plane with no three points collinear. By imitating Behrend's construction of sparse sets of integers avoiding 3-term arithmetic progressions, we obtain an upper bound for b(n) asymptotically smaller than n^{1+epsilon} for every fixed epsilon>0.

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