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!

In the fourth and final part of our series celebrating 300 years since Leonhard Euler's birth, we let Euler speak for himself. 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.

The Plus anniversary year — A word from the editors

Outer space: How to beat that photocopier

Nineteenth-century German mathematician Leopold Kronecker once said

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

For millennia, puzzles and paradoxes have forced mathematicians to continually rethink their ideas of what proofs actually are. Jon Walthoe explains the tricks involved and how great thinkers like Pythagoras, Newton and Gödel tackled the problems.