## Articles

**John Webb**takes us through some of the mathematics involved, introducing us to some of the colourful characters who led the way.

**John D. Barrow**explains.

**John H. Webb**explains.

**Kona Macphee**examines the prefix property, one of the important features of a good code.

**Robert Hunt**concludes our Origins of Proof series by asking what a proof really

*is*, and how we know that we've actually found one. One for the philosophers to ponder...

**Kevin Jones**investigates the links between music and mathematics, throwing in limericks, Fibonacci and Scott Joplin along the way.

*Plus*is proud to present an extended version of his winning entry for the THES/OUP 1999 Science Writing Prize.

**Janna Levin**tells us more.