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arXiv · 2510.21195

Reconstruction of C_4-free graphs from the set of closed neighborhoods and digital convexity

Steffen Borgwardt·MacKenzie Carr·Ce Chen·Wayne Ge·Stephen G. Hartke·Yixuan Huang·Alex Moon
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Abstract

Fomin, Kratochv\'il, Lokshtanov, Mancini, and Telle showed that every $C_{4}$-free graph is reconstructible from the \emph{multiset} of closed neighborhoods. We strengthen their result proving that every $C_{4}$-free graph is reconstructible from the \emph{set} of closed neighborhoods. This extends the work of Lafrance et al.\ by showing that all $C_{4}$-free graphs, and hence all graphs of girth at least five, are reconstructible from their digitally convex sets. A subset $S$ of vertices in a graph $G$ is digitally convex if, for every vertex $v \notin S$, there is a private neighbor of $v$. We establish that reconstruction from digitally convex sets is equivalent to reconstruction from the set of closed neighborhoods.

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Steffen Borgwardt, MacKenzie Carr, Ce Chen, Wayne Ge, Stephen G. Hartke, Yixuan Huang, Alex Moon. 2025-10-24. Reconstruction of C_4-free graphs from the set of closed neighborhoods and digital convexity. https://arxiv.org/abs/2510.21195

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