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.

Also huffduffed as…

  1. The Number Four

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  2. The Number Four

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  3. The Number Four

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  4. The Number Four

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  5. The Number Four

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  6. Another Five Numbers, 1: The Number Four

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  7. The Number Four

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  8. The Number Four

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  9. The Number Four

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  10. The Number Four

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  11. The Number Four

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  12. The Number Four

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  13. The Number Four

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  14. The Number Four

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