img12 - Chalkdust

…and the Hasse diagram where $abc$ is a critical maximum and $d$ is a critical minimum

Calum is a lecturer in physics at Edge Hill University where he studies topological solitons and enjoys talking about maths and physics to anyone who will listen. He can often be found on the side of a mountain or out on a bike, talking to himself about solitons.

Oπnions: In defence of toy models
Calum gets on his soap box about toy models
Cryptic wordsearch, Issue 19
Can you solve it?
On the cover: skyrmions
Sven Bjarke Gudnason and Calum Ross introduce you to the wonderful world of skyrmions
What’s odd about Pascal’s triangle?
Graeme Foster asks if there are more odd or even numbers in the triangle
An Introduction to the Math of Voting Methods
We review the second of this year’s nominees for the Book of the Year
Do you have too many or too few friends?
Do we have a natural limitation on the number of friends that we have?