## infinite series

What is 1-1+1-1+1-1+...? How infinite sums challenge our notion of arithmetic.

*A disappearing number*, a work by Complicite, inspired by the mathematical collaboration of Hardy and Ramanujan.

**Rachel Thomas**went to see the play, and explains some of the maths. You can also read her interview with Victoria Gould about how the show was created.

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

**C. J. Sangwin**shows us how eighteenth-century mathematician Leonhard Euler solved one of the foremost infinite series problems of his day.