Preliminaries
摘要
In this chapter we briefly present basic properties of geodesics and cut locicut locus on convex polyhedra, the star-unfolding,unfoldingstar- prove a rigidity result,rigidity and describe the technique of vertex-merging.vertex-merging All of these geometric tools will be needed subsequently. The reader might skip this section and return to it as the tools are deployed, for which purpose we provide pointers.