# Generic unlabeled global rigidity

 Authors: Steven J. Gortler, Louis Theran, and Dylan P. Thurston Preprint: 1806.08688, 2018 Full text: arXiv

Let $\mathbf{p}$ be a configuration of $n$ points in $\mathbb{R}^d$ for some $n$ and some $d \ge 2$. Each pair of points has a Euclidean length in the configuration. Given some
graph $G$ on $n$ vertices, we measure the point-pair lengths corresponding to the edges of $G$.

In this paper, we study the question of when a generic $\mathbf{p}$ in $d$ dimensions will be uniquely determined (up to an unknowable Euclidean transformation) from a given set of point-pair lengths together with knowledge of $d$ and $n$. In this setting the lengths are given simply as a set of real numbers; they are not labeled with the combinatorial data that describes which point-pair gave rise to which length, nor is data about $G$ given.

We show, perhaps surprisingly, that in terms of generic uniqueness, labels have no effect. A generic configuration is determined by an unlabeled set of point-pair lengths(together with $d$ and $n$) iff it is determined by the labeled edge lengths.