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Tagged with “four” (1)

  1. The Number Four

    Episode one of Another Five Numbers, the BBC radio series presented by Simon Singh.

    Simon Singh's journey begins with the number 4, which for over a century has fuelled one of the most elusive problems in mathematics: is it true that any map can be coloured with just 4 colours so that no two neighbouring countries have the same colour? This question has tested some of the most imaginative minds — including Lewis Carroll's — and the eventual solution has aided the design of some of the world's most complex air and road networks.

    —Huffduffed by srushe