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irrational number

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Pi

Easy as pi?

This article explores this most beautiful of numbers. Find out its definition, why its value can only ever be approximated, what it has to do with waves, and why it contains the history of the Universe. 

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pi cake

Happy pi day 2025!

We celebrate pi day with a look at the number itself as well as some of its fellow numbers we particularly like.

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Editorial

The Plus anniversary year — A word from the editors

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A tale of two curricula: Euler's algebra text book

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.
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The origins of proof III: Proof and puzzles through the ages

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.