Generic unlabeled global rigidity
| Authors: | Steven J. Gortler, Louis Theran, and Dylan P. Thurston |
| Journal: | Forum of Mathematics, Sigma, 2019. |
| Full text: | arXiv • DOI |
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.