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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…
math.MG2016
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…