Generic projections of the ${\mathrm{H}}_4$ configuration of points

Abstract

In the present note we give an example of a finite set of points in ${\mathbb{P}}^3$ which has the so-called geproci property, but it is neither a grid nor a half-grid. This answers a question on the existence of such sets rised by Pokora, Szemberg and Szpond [arXiv:2010.08863].

arXiv comment7 pages