A bound on the treewidth of planar even-hole-free graphs

Abstract

The class of planar graphs has unbounded treewidth, since the k × k grid, ∀ k ∈ N , is planar and has treewidth k . So, it is of interest to determine subclasses of planar graphs which have bounded treewidth. In this paper, we show that if G is an even-hole-free planar graph, then it does not contain a 9×9 grid minor. As a result, we have that even-hole-free planar graphs have treewidth at most 49.