We show that a graph class $\cal G$ has bounded expansion if and only if it has bounded $r$-neighbourhood complexity, i.e. for any vertex set $X$ of any subgraph $H$ of $G\in\cal G$, the number of subsets of $X$ which are exact $r$-neighbourhoods of vertices of $H$ on $X$ is linear to the size of $X$. This is established by bounding the $r$-neighbourhood complexity of a graph in terms of both its $r$-centred colouring number and its weak $r$-colouring number, which provide known characterisations to the property of bounded expansion.
Characterising Bounded Expansion by Neighbourhood Complexity
F. Reidl,Fernando Sánchez Villaamil,K. Stavropoulos
Published 2016 in European journal of combinatorics (Print)
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- Publication year
2016
- Venue
European journal of combinatorics (Print)
- Publication date
2016-03-31
- Fields of study
Mathematics, Computer Science
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