Seminar series
Date
Wed, 01 Mar 2017
Time
11:00 -
12:30
Location
N3.12
Speaker
Gareth Wilkes
Organisation
University of Oxford
In this talk I will describe another strong link between the behaviour of a 3-manifold and the behaviour of its fundamental group- specifically the theorem that the group splits as a free product if and only if the 3-manifold may be divided into two parts using a 2-sphere inducing this splitting. This theorem is for some reason known as Kneser's conjecture despite having been proved half a century ago by Stallings.