# Schottky_arrangement-1

A valid arrangement of circles, with their
interiors shaded. Note that the straight
line is an infinite radius circle through $\infty$,
so it still counts.

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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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?
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David Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11
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Using Markov chains to calculate some interesting tennis stats!