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| Keywords: 7x-torus.svg 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 en wikipedia 2006-12-07 David Eppstein wikipedia en David Eppstein original upload log page en wikipedia 7x-torus svg 2006-12-07 07 30 David Eppstein 256×256×0 3809 bytes <nowiki>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 </nowiki> Files by User David Eppstein from en wikipedia Graph coloring Hexagonal tilings Heawood graph | ||||
