Combinatorics Seminar: Boris Lishak "The space of triangulations of a compact 4-manifold"

Mon, 08/01/201811:00-12:30
Eilat Hall at IIAS
There are exponentially many triangulations of a fixed manifold extremely distant from each other in some natural metric. I will discuss similar results for contractible 2-complexes. In order to prove these for the manifold being the sphere (or a contractible complex) one needs to create topology out of nothing. This is done by studying group theory of the trivial group.