Article ID Journal Published Year Pages File Type
4651907 Electronic Notes in Discrete Mathematics 2015 7 Pages PDF
Abstract

We prove that every triangle-free planar graph can have its set of vertices partitioned into two sets, one inducing a forest and the other a forest with maximum degree at most 5. We also show that if for some d, there is a triangle-free planar graph that cannot be partitioned into two sets, one inducing a forest and the other a forest with maximum degree at most d, then it is an NP-complete problem to decide if a triangle-free planar graph admits such a partition.

Related Topics
Physical Sciences and Engineering Mathematics Discrete Mathematics and Combinatorics