Development of Curves on Polyhedra Via Conical Existence

Joseph O'Rourke, Smith College
Costin Vîlcu, Institute of Mathematics of the Romanian Academy

Abstract

We establish that certain classes of simple, closed, polygonal curves on the surface of a convex polyhedron develop in the plane without overlap. Our primary proof technique shows that such curves "live on a cone," and then develops the curves by cutting the cone along a "generator" and attening the cone in the plane. The conical existence results support a type of source unfold- ing of the surface of a polyhedron, described elsewhere.