• Colouring a Torus

    If a map is drawn on a torus, colours are required to colour each region or country, with countries adjacent to each other - having a common border, being coloured differently. Note that countries meeting at a single point are not considered to be...

    https://astarmathsandphysics.com/university-maths-notes/topology/2128-colouring-a-torus.html

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