Injectivity radii of hyperbolic polyhedra
Abstract
We define the injectivity radius of a Coxeter polyhedron in H3 to be half the shortest translation length among hyperbolic/loxodromic elements in the orientation-preserving reflection group. We show that, for finite-volume polyhedra, this number is always less than 2.6339..., and for compact polyhedra it is always less than 2.1225... .
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