Seminar series
Date
Wed, 29 May 2019
16:00
16:00
Location
C1
Speaker
Sam Shepherd
Organisation
Oxford University
Leighton's Theorem states that if two finite graphs have a common universal cover then they have a common finite cover. I will present a new proof of this using groupoids, and then talk about two generalisations of the theorem that can also be tackled with this groupoid approach: one gives us control over the local structure of the common finite cover, and the other deals with graphs of spaces.