期刊
COMPUTATIONAL GEOMETRY-THEORY AND APPLICATIONS
卷 24, 期 2, 页码 51-62出版社
ELSEVIER
DOI: 10.1016/S0925-7721(02)00091-3
关键词
unfolding polyhedra; nets; discrete geometry
Unfolding a convex polyhedron into a simple planar polygon is a well-studied problem. In this paper, we study the limits of unfoldability by studying nonconvex polyhedra with the same combinatorial structure as convex polyhedra. In particular, we give two examples of polyhedra, one with 24 convex faces and one with 36 triangular faces, that cannot be unfolded by cutting along edges. We further show that such a polyhedron can indeed be unfolded if cuts are allowed to cross faces. Finally, we prove that open polyhedra with triangular faces may not be unfoldable no matter how they are cut. (C) 2002 Elsevier Science B.V. All rights reserved.
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