The Volume Spectrum of Hyperbolic 4-Manifolds
The Volume Spectrum of Hyperbolic 4-Manifolds
We construct complete, open, hyperbolic 4-manifolds of smallest volume by gluing together the sides of a regular ideal 24-cell in hyperbolic 4-space. We also show that the volume spectrum of hyperbolic 4-manifolds is the set of all positive integral multiples of 47π2/3.