More from Chalkdust
The big argument: What’s the best way to end a proof?
QED or $\square$?
Cryptic crossnumber (including hints)
Looking for a challenge? Try our cryptic crossnumber—with hints and tips so anyone can have a go!
Weirdonacci numbers
Like Fibonacci, but weird. Robert J Low and Thierry Platini explain
On the cover: Apollonian packing
David Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11
Page 3 model: Crowd control
Modelling a Saturday afternoon on Oxford Street
Prime jewellery
Make your own treasures, guaranteed to be priceless on a future episode of Antiques Roadshow