tangent_circles-1 - Chalkdust

Given three mutually tangent circles (black) there are usually exactly two others (blue) tangent
to all three.

David teaches and researches maths at King’s College London, with a focus on geometry. In his spare time he likes to make music and read poetry.

Ode to Newtonian mechanics
(after Sonnet 130)
My favourite LaTeX package
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!
Page 3 model: Solitons
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