# 4

On the left: $(3,3,3,3,3,3)$ and $(3,3,6,6); on the right:$(3,3,6,6)$and$(3,6,3,6)\$.

David is a final year PhD student at UCL studying geometric group theory. When not doing maths he can usually be found singing or playing the flute.

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Peter Rowlett is gonna need a bigger board
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The Chalkdust editors share some of their favourites
• ### In conversation with Ulrike Tillmann

Sophie Maclean and David Sheard speak to a very top(olog)ical mathematician!

Solitons
• ### Chalkdust issue 11 puzzle hunt #3

David Sheard sets the third puzzle. Can you solve it?
• ### On the cover: Apollonian packing

David Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11