2 papers
math.CO2025
Counting for rigidity under projective transformations in the plane
Leah Wrenn Berman, Signe Lundqvist, Bernd Schulze +4
Let be a set of points and a set of lines in the (extended) Euclidean plane, and , where means that point and line are incid…
math.MG2025
Projective rigidity of point-line configurations in the plane
Leah Berman, Signe Lundqvist, Bernd Schulze +4
In this paper, we establish a general setup for studying incidence-preserving motions of projective geometric configurations of points and lines via a "projective rigidity matrix".…