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![]() Date: 2012-10-25 14:50:50Deltahedra Platonic solids Tetrahedron packing Crystallography Spheres Packing problem Tetrahedron Sphere packing Octahedron Geometry Euclidean geometry Discrete geometry | Source URL: www.ams.orgDownload Document from Source WebsiteFile Size: 322,19 KBShare Document on Facebook |