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In conversation with Ulrike TillmannSophie Maclean and David Sheard speak to a very top(olog)ical mathematician!
Page 3 model: SolitonsSolitons
Chalkdust issue 11 puzzle hunt #3David Sheard sets the third puzzle. Can you solve it?
On the cover: Apollonian packingDavid Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11