30 avril 2021
30 avril 2021 de 15 h 00 à 16 h 00 (heure de Montréal/HNE)
After a historical introduction to knot theory, the talk will be centered around two knot invariants, the Alexander polynomial and the signature. The aim is to introduce a finite abelian group that controls their relationship, and to illustrate this by several examples. Using Seifert matrices, the geometric questions are translated into arithmetic ones.