16 citations · 70 across the 19 of their papers we have counts for
4 papers · 1 filter
Affine functions on Alexandrov spaces
Christian Lange, Stephan Stadler
We show that every finite-dimensional Alexandrov space X with curvature bounded from below embeds canonically into a product of an Alexandrov space with the same curvature bound an…
Seifert fibrations of lens spaces
Hansjörg Geiges, Christian Lange
We classify the Seifert fibrations of any given lens space L(p,q). We give an algorithmic construction of a Seifert fibration of L(p,q) over the base orbifold S^2(m,n) with the cop…
A Hamiltonian version of a result of Gromoll and Grove
Urs Frauenfelder, Christian Lange, Stefan Suhr
The theorem that if all geodesics of a Riemannian two-sphere are closed they are also simple closed is generalized to real Hamiltonian structures on . For reversible…
On metrics on 2-orbifolds all of whose geodesics are closed
Christian Lange
We show that the geodesic period spectrum of a Riemannian 2-orbifold all of whose geodesics are closed depends, up to a constant, only on its orbifold topology and compute it. In t…