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.

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
Carnival of Mathematics 162
This month’s round up of mathematical blog posts from all over the internet
Names for large numbers
Extending the million, billion, trillion system to much, much bigger numbers
Page 3 model: Traffic flow
Ever been stuck in motorway traffic which seems to have no reason? A model for traffic flow explains why.

More from Chalkdust

Oπnions: In defence of toy models

Cryptic wordsearch, Issue 19

On the cover: skyrmions

Carnival of Mathematics 162

Names for large numbers

Page 3 model: Traffic flow