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M. Winter
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Can every simple polytope be inscribed?

It is known that not every convex polytope (even polyhedron, e.g. this one) can be made inscribed, that is, we cannot always move its vertices so that

  • all vertices end up on a common sphere, and
  • the polytope has not changed its combinatorial type in the process.

Is there anything known about whether this is possible if we instead ask for simple polytopes, i.e., $d$-dimensional polytopes of vertex-degree $d$?

M. Winter
  • 13.6k
  • 3
  • 29
  • 70