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The two ways down shown on a Hasse diagram

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
Constructing the cover of Issue 10
21 simple steps to draw your own Islamic pattern!
Seeing double
Take a ball, divide it into parts, glue them back and get two identical copies of your ball!
You can count on Dirichlet
Counting the divisors of an integer turns out to be a rather hard problem

More from Chalkdust

Oπnions: In defence of toy models

Cryptic wordsearch, Issue 19

On the cover: skyrmions

Constructing the cover of Issue 10

Seeing double

You can count on Dirichlet