Prof. Emo Welzl and Prof. Bernd Gärtner
|Mittagsseminar Talk Information|
Date and Time: Thursday, October 17, 2019, 12:15 pm
Duration: 30 minutes
Location: CAB G51
Speaker: Patrick Schnider
Consider the following problem: Let L be an arrangement of n lines in R^3 colored red, green, and blue. Does there exist a vertical plane P such that a line on P simultaneously bisects all three classes of points in the cross-section given by the intersection of L and P? In a previous talk at the Mittagsseminar I showed the existence of such a plane using topological methods. In this talk, we will discuss an alternative proof of this fact, using only methods from discrete geometry. With this combinatorial proof at hand, we devise an O(n^2 log^2(n)) time algorithm to find such a plane and the bisector of the induced cross-section. We do this by providing a general framework, which can be applied to solve similar problems on cross-sections and kinetic points. This is joint work with Alexander Pilz.
Automatic MiSe System Software Version 1.4803M | admin login