Roland Hildebrand

collaborators

Showing math.DGShow all

2 papers · 1 filter

math.DG2026

Four-Dimensional Semi-Homogeneous Convex Cones: A Complete Classification

Amir Valiakhmetov, Ewsey Obzherin, Alexey Chernov +1

We classify all four-dimensional semi-homogeneous convex cones, i.e., closed, pointed, full-dimensional cones whose connected automorphism group has principal orbits of codimension…

math.DG2024

Half-dimensional immersions into the para-complex projective space and Ruh-Vilms type theorems

Josef F. Dorfmeister, Roland Hildebrand, Shimpei Kobayashi

In this paper we study isometric immersions $f : M^{n} \to C^{'} P^{n}$ of an $n$ -dimensional pseudo-Riemannian manifold $M^{n}$ into the $n$ -dimensional para-complex pro…