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: Tuesday, March 10, 2009, 12:15 pm

Duration: This information is not available in the database

Location: CAB G51

Speaker: Philipp Zumstein

On Polychromatic 3- and 4-Colorings of Plane Graphs

A plane graph is polychromatic k-colorable if there exists a k-coloring of its vertices such that in each face all k colors appear. We will discuss several results implying that a graph is polychromatic 3- or 4-colorable, which have consequences to some variant of the art gallery problem.

A simple bipartite 2-connected plane graph has a polychromatic 3-coloring, which follows from a result by Hoffmann and Kriegel that these graphs admit an even triangulation. Horev and Krakovski have shown that all plane graphs with maximum degree at most 3 are polychromatic 3-colorable with two exceptions. The special graph class of rectangular partitions is polychromatic 4-colorable.


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