## irrational number

We take the real numbers for granted, but what are they really?

Here's one of the most elegant proofs in all of maths. Rejoice in its simplicity!

**Chris Sangwin**takes us through excerpts of Euler's algebra text book and finds that modern teaching could have something to learn from Euler's methods.

God created the integers, all the rest is the work of man.

**Jon Walthoe**explains the tricks involved and how great thinkers like Pythagoras, Newton and Gödel tackled the problems.