## Articles

**Abigail Kirk**explores one of the formulae that carry his name.

**Tom Körner**'s explanation really is a piece of cake, served up with a hefty estimate of pi.

**Shahn Majid**met up with

*Plus*to explain.

*Plus*went to see members of Norman Foster's group of architects to learn about the maths behind architecture.

**Joan Lasenby**tells us about the mathematics and engineering behind them.

**Robin Wilson**starts off a four part series on Euler with a look at his life and work.

**Winner of the general public category**. Enormous is the right word: this theorem's proof spans over 10,000 pages in 500 journal articles and no-one today understands all its details. So what does the theorem say?

**Richard Elwes**has a short and sweet introduction.

What goes up must come down — or does it? Find out how to cheat gravity with

**Julian Havil**.