MathDB
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 MM outside it? (The polyhedron is made out of an opaque material.)
(AY Belov, S Markelov)