Uli Wagner

collaborators

2 papers

math.CO2025

Sublevels in arrangements and the spherical arc crossing number of complete graphs

Elizaveta Streltsova, Uli Wagner

Levels and sublevels in arrangements -- and, dually, $k$ -sets and $(\leq k)$ -sets -- are fundamental notions in discrete and computational geometry and natural generalizations of c…

math.CO2025

Linear relations between face numbers of levels in arrangements

Elizaveta Streltsova, Uli Wagner

We study linear relations between face numbers of levels in arrangements. Let $V = {v_{1}, \dots, v_{n}} \subset R^{r}$ be a vector configuration in general position, and…