Unneccessarily sophisticated proofs that the trefoil is non-trivial.

by Budney Ryan (University of Victoria, Canada)

Wednesday 11 Dec 2024, 18:00 → 19:00 Europe/Kiev

https://bbb.imath.kiev.ua/rooms/boh-0lk-tl9-vjx/join (ONLINE)

Abstract: I will describe a sequence of closely-related but increasingly-sophisticated proofs of the non-triviality of the trefoil  knot. In the end we conclude the mapping-class group of a 4-manifold is non-trivial.