fire9 - Chalkdust

The centred square numbers can be built from a central dot and four copies of a triangle number.

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.

Dear Dirichlet, Issue 19
Game shows, flight and social media bots are among the problems solved in this issue's Dear Dirichlet agony aunt column
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
Slide rules: the early calculators
When slide rules used to rule... find out why they still do
Hooke’s Monument
The Great Fire of London, a little-known polymath and a Monument...
£100 Prize Crossnumber, Issue 01
Our original £100 prize crossnumber. Download and enjoy!

More from Chalkdust

Dear Dirichlet, Issue 19

Cryptic wordsearch, Issue 19

On the cover: skyrmions

Slide rules: the early calculators

Hooke’s Monument

£100 Prize Crossnumber, Issue 01