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arXiv · 1801.06760

Every planar graph without $i$-cycles adjacent simultaneously to $j$-cycles and $k$-cycles is DP-$4$-colorable when $\{i,j,k\}=\{3,4,5\}$

Pongpat Sittitrai·Kittikorn Nakprasit
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Abstract

DP-coloring is a generalization of a list coloring in simple graphs. Many results in list coloring can be generalized in those of DP-coloring. Kim and Ozeki showed that planar graphs without $k$-cycles where $k=3,4,5,$ or $6$ are DP-$4$-colorable. Recently, Kim and Yu extended the result on $3$- and $4$-cycles by showing that planar graphs without triangles adjacent to $4$-cycles are DP-$4$-colorable. Xu and Wu showed that planar graphs without $5$-cycles adjacent simultaneously to $3$-cycles and $4$-cycles are $4$-choosable. In this paper, we extend the result on $5$-cycles and triangles adjacent to $4$-cycles by showing that planar graphs without $i$-cycles adjacent simultaneously to $j$-cycles and $k$-cycles are DP-$4$-colorable when $\{i,j,k\}=\{3,4,5\}.$ This also generalizes the result of Xu and Wu.

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Pongpat Sittitrai, Kittikorn Nakprasit. 2018-01-21. Every planar graph without $i$-cycles adjacent simultaneously to $j$-cycles and $k$-cycles is DP-$4$-colorable when $\{i,j,k\}=\{3,4,5\}$. https://arxiv.org/abs/1801.06760

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