English

On bodies in $\mathbb{R}^5$ with directly congruent projections or sections

Metric Geometry 2018-01-30 v1

Abstract

Let KK and LL be two convex bodies in R5{\mathbb R^5} with countably many diameters, such that their projections onto all 44 dimensional subspaces containing one fixed diameter are directly congruent. We show that if these projections have no rotational symmetries, and the projections of K,LK,L on certain 3 dimensional subspaces have no symmetries, then K=±LK=\pm L up to a translation. We also prove the corresponding result for sections of star bodies.

Keywords

Cite

@article{arxiv.1801.08987,
  title  = {On bodies in $\mathbb{R}^5$ with directly congruent projections or sections},
  author = {M. Angeles Alfonseca and Michelle Cordier and Dmitry Ryabogin},
  journal= {arXiv preprint arXiv:1801.08987},
  year   = {2018}
}

Comments

18 pages, 2 figures