File:7x-torus.svg
Summary
| Description |
A partition of the torus into seven mutually adjacent regions, requiring seven colors. The torus is shown unrolled onto a square; points on the top edge of the square should be thought of as connected to the corresponding points on the bottom edge of the square, and points on the left edge of the square should be thought of as connected to the corresponding points on the right edge of the square. The edges and vertices of the regions form an embedding of the en:Heawood graph onto the torus. A combinatorially equivalent partition of the torus into regions forms the set of faces of the en:Szilassi polyhedron. Category:Mathematics images |
| Date | 7 December 2006 (original upload date) |
| Source | Transferred from en.wikipedia to Commons. |
| Author | David Eppstein at English Wikipedia |
Licensing
 |
This work has been released into the public domain by its author, David Eppstein at English Wikipedia. This applies worldwide. In some countries this may not be legally possible; if so: David Eppstein grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
Original upload log
The original description page was here. All following user names refer to en.wikipedia.
- 2006-12-07 07:30 David Eppstein 256×256×0 (3809 bytes) A partition of the torus into seven mutually adjacent regions, requiring seven colors. The torus is shown unrolled onto a square; points on the top edge of the square should be thought of as connected to the corresponding points on the bottom edge of the