## geometric series

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

**Yutaka Nishiyama**and

**Steve Humble**can give you the winning advantage.

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

**John Webb**applies some divergent thinking, taking in the weather, traffic flow and card shuffling along the way.

**John H. Webb**explains.