TOT 461 1995 Spring S A6 nonconvex polyhedron existence
Source:
July 9, 2024
geometrycombinatoricscombinatorial geometry
Problem Statement
Does there exist a nonconvex polyhedron such that not one of its vertices is visible from a point outside it? (The polyhedron is made out of an opaque material.)(AY Belov, S Markelov)