Deformation classification of typical configurations of 7 points in then real projective plane

摘要

A configuration of 7 points in RP2 is called typical if it has no collinear triples and no coconic sextuples of points. We show that there exist 14 deformation classes of such configurations. This yields classification of real Aronhold sets. (C) 2015 Elsevier B.V. All rights reserved.