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A Thomassen-type method for planar graph recoloring

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arxiv 2006.09269 v1 pith:QHUMRVOR submitted 2020-06-16 math.CO

classification math.CO
keywords graphcoloringsdiameterplanarverticesadjacentcolorcoloring
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abstract

The reconfiguration graph $R_k(G)$ for the $k$-colorings of a graph $G$ has as vertices all possible $k$-colorings of $G$ and two colorings are adjacent if they differ in the color of exactly one vertex. We use a list coloring technique inspired by results of Thomassen to prove that for a planar graph $G$ with $n$ vertices, $R_{10}(G)$ has diameter at most $8n$, and if $G$ is triangle-free, then $R_7(G)$ has diameter at most $7n$.

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