Department of Pure Mathematics and Mathematical Statistics 

DPMMS > Research > Category Theory Seminar 
A weekly seminar on category theory and its applications in algebra, logic, geometry, topology, etc. Meetings are held at 2.15pm on Tuesdays in Room MR9 of the CMS (Pavilion B). Part III students are particularly welcome.
Peter Lumsdaine
Algebraic Set Theory
Peter Johnstone (Cambridge)
What I don't know about the free topos