More from Chalkdust
The big argument: What’s the best way to end a proof?
QED or $\square$?
A canal runs through it
Colin Beveridge barges in and admires some curious railway bridges
Handbook of equations
Forgotten how to draw a log graph? No need to panic – here's a handy guide!
Why knot?
You can un-knot a knot, by cutting it not?
The limit does not exist!
Lindsay Lohan is really good at L'Hôpital's rule.
The joys of the Jacobian
Robert Smith? tells us how his favourite matrix saves lives