16 citations · 70 across the 19 of their papers we have counts for
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math.DS2019★ 3 cited
On the rigidity of Zoll magnetic systems on surfaces
Luca Asselle, Christian Lange
In this paper we study rigidity aspects of Zoll magnetic systems on closed surfaces. We characterize magnetic systems on surfaces of positive genus given by constant curvature metr…
math.DG2019
Closed geodesics on compact orbifolds and on noncompact manifolds
Christian Lange, Christoph Zwickler
We prove the existence of a nonconstant closed geodesic on every odd-dimensional compact Riemannian orbifold and on every connected, noncontractible Riemannian manifold that admits…
math.MG2019
A diameter gap for quotients of the unit sphere
Claudio Gorodski, Christian Lange, Alexander Lytchak +1
We prove that for any isometric action of a group on a unit sphere of dimension larger than one, the quotient space has diameter zero or larger than a universal dimension-independe…