Some conditions on 5-cycles that make planar graphs 4-choosable
Combinatorics
2017-06-19 v1
Abstract
Consider two conditions on a graph: (1) each 5-cycle is not a subgraph of 5-wheel and does not share exactly one edge with 3-cycle, and (2) each 5-cycle is not adjacent to two 3-cycles and is not adjacent to a 4-cycle with chord. We show that if a planar graph satisfies one of the these conditions, then is 4-choosable. This yields that if each 5-cycle of a planar graph is not adjacent a 3-cycle, then is 4-choosable.
Keywords
Cite
@article{arxiv.1706.05141,
title = {Some conditions on 5-cycles that make planar graphs 4-choosable},
author = {Pongpat Sittitrai and Kittikorn Nakprasit},
journal= {arXiv preprint arXiv:1706.05141},
year = {2017}
}