File:Torus with seven colours.svg

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Description	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.
Date	3 August 2006 (original upload date)
Source	Transferred from en.wikipedia; transferred to Commons by User:Skiff using CommonsHelper.
Author	Original uploader was Cbuckley at en.wikipedia
Permission ( Reusing this file)	Released into the public domain (by the author).

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Four colour theorem

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