Cop-width, flip-width and strong colouring numbers

Cop-width and flip-width are new families of graph parameters introduced by Toru\'nczyk (2023) that generalise treewidth, degeneracy, generalised colouring numbers, clique-width and twin-width. In this paper, we bound the cop-width and flip-width of a graph by its strong colouring numbers. In particular, we show that for every $r\in \mathbb{N}$, every graph $G$ has $\text{copwidth}_r(G)\leq \text{scol}_{4r}(G)$. This implies that every class of graphs with linear strong colouring numbers has linear cop-width and linear flip-width. We use this result to deduce improved bounds for cop-width and flip-width for various sparse graph classes.

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Publication Details

Journal
Discrete Mathematics & Theoretical Computer Science
Published
2025-05-07
DOI
https://doi.org/10.46298/dmtcs.14976
Primary Topic
Advanced Graph Theory Research
Type
article
Field-Weighted Citation Impact
0.00

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article

Cop-width, flip-width and strong colouring numbers

Robert Hickingbotham
Discrete Mathematics & Theoretical Computer Science
Advanced Graph Theory Research
article

Cop-width, flip-width and strong colouring numbers

Robert Hickingbotham
article en

Abstract

Cop-width and flip-width are new families of graph parameters introduced by Toru\'nczyk (2023) that generalise treewidth, degeneracy, generalised colouring numbers, clique-width and twin-width. In this paper, we bound the cop-width and flip-width of a graph by its strong colouring numbers. In particular, we show that for every $r\in \mathbb{N}$, every graph $G$ has $\text{copwidth}_r(G)\leq \text{scol}_{4r}(G)$. This implies that every class of graphs with linear strong colouring numbers has linear cop-width and linear flip-width. We use this result to deduce improved bounds for cop-width and flip-width for various sparse graph classes.

Discrete Mathematics & Theoretical Computer ScienceVol. vol. 27:2(Graph Theory)
Australian Government
Openalex Percentile: Top 89%
Advanced Graph Theory Research
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