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math.CO2018
Vertex-Facet Assignments For Polytopes
Thomas Jahn, Martin Winter
Motivated by the search for reduced polytopes, we consider the following question: For which polytopes exists a vertex-facet assignment, that is, a matching between vertices and no…
math.MG2018
Uniqueness of circumcenters in generalized Minkowski spaces
Bernardo González Merino, Thomas Jahn, Christian Richter
In an -dimensional normed space every bounded set has a unique circumball if and only if every set of cardinality two has a unique circumball and if and only if the unit ball of…