## graph theory

*On the origin of species*, but also 200 years since the birth of its author, Charles Darwin. At the heart of Darwin's theory of evolution lies a beautifully simple mathematical object: the evolutionary tree. In this article we look at how maths is used to reconstruct and understand it.

**Imre Leader**looks at the colourful world of Ramsey Theory.

**Robert Leese**explains how the mathematics of colouring graphs can help avoid interference on your mobile phone.

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