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From satellites to the London Olympics, all in one career

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Discover why the number 6174 is so mysterious.

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September 2008
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Ramsey number

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Sometimes a mathematical object can be so big that, however disorderly we make the object, areas of order are bound to emerge. Imre Leader looks at the colourful world of Ramsey Theory.

Tags: Ramsey theory : graph theory : colouring : Ramsey number