Calculus 45S: Four Colour Sunday!

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Sunday, April 09, 2006

Four Colour Sunday!

You may have heard that any map can be coloured with four colours in such a way that neighbouring countries receive different colours. That it can be always done is one thing. How to do it is another. Are you ready to start colouring?

(Thanks again to Think Again!)

Calculus 45S

Sunday, April 09, 2006

Four Colour Sunday!

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