English: By joining the single arrows together and the double arrows together, we get a torus with seven mutually touching regions.
Español: Por juntar las dos flechas solas, y juntar las dos flechas dobles, se crea un toro con siete regiones, que cada una de las cuales toca a cada otra.
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Original upload log
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2006-08-03 00:05 Cbuckley 991×450 (1964 bytes) Uploaded new version of [[:Image:Torus-with-seven-colours.png]].
Captions
By joining the single arrows together and the double arrows together, one obtains a torus with seven mutually touching regions; therefore seven colors are necessary.
Por juntar las dos flechas solas, y juntar las dos flechas dobles, se crea un toro con siete regiones, que cada una de las cuales toca a cada otra.