Shotgun Assembly of Erd\H{o}s-R\'enyi Random Graphs
Julia Gaudio, Elchanan Mossel · arXiv (Cornell University) · 2020
Graph shotgun assembly refers to the problem of reconstructing a graph from a collection of local neighborhoods. In this paper, we consider shotgun assembly of Erd\H{o}s-R\'enyi random graphs $G(n, p_n)$, where $p_n = n^{-\alpha}$ for $0 < \alpha < 1$. We consider both reconstruction up to isomorphism as well as exact reconstruction (recovering the vertex labels as well as the structure). We show that given the collection of distance-$1$ neighborhoods, $G$ is exactly reconstructable for $0 < \alpha < \frac{1}{3}$, but not reconstructable for $\frac{1}{2} < \alpha < 1$. Given the collection of distance-$2$ neighborhoods, $G$ is exactly reconstructable for $0 < \alpha < \frac{1}{2}$, but not reconstructable for $\frac{3}{4} < \alpha < 1$.