Covering and coloring polygon-circle graphs


Polygon-circle graphs are intersection graphs of polygons inscribed in a circle. This class of graphs includes circle graphs (intersection graphs of chords of a circle), circular arc graphs (intersection graphs of arcs on a circle), chordal graphs and outerplanar graphs. We investigate binding functions for chromatic number and clique covering number of polygon-circle graphs in terms of their clique and independence numbers. The bound ~ log ~, for the clique covering number is asymptotically best possible. For chromatic number, the upper bound we prove is of order 2 ~, which is better than previously known upper bounds for circle graphs.

DOI: 10.1016/S0012-365X(96)00344-5

Extracted Key Phrases


Citations per Year

58 Citations

Semantic Scholar estimates that this publication has 58 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Kostochka1997CoveringAC, title={Covering and coloring polygon-circle graphs}, author={Alexandr V. Kostochka and Jan Kratochv{\'i}l}, journal={Discrete Mathematics}, year={1997}, volume={163}, pages={299-305} }