Connecting face hitting sets in planar graphs

We show that any face hitting set of size n of a connected planar graph with a minimum degree of at least 3 is contained in a connected subgraph of size 5n − 6. Furthermore we show that this bound is tight by providing a lower bound in the form of a family of graphs. This improves the previously known upper and lower bound of 11n−18 and 3n respectively by Grigoriev and Sitters. Our proof is valid for simple graphs with loops and generalizes to graphs embedded in surfaces of arbitrary genus.

• Type: Journal
• Year: 2010
• Where: IPL
• Authors: Pascal Schweitzer, Patrick Schweitzer
• Keywords: Connected Planar Graph, Connected Subgraph, IPL 2010, Lower Bound