# Seminar of Algebra

### Framed little disks and the Grothendieck Teichmüller group

Speaker:
Marcy Robertson (University of Melbourne)
Email:
marcy.robertson@unimelb.edu.au
Location:
Departamento de Álgebra
Date:
Tue, 25 oct 2016 12:30
Bio:

In this talk we describe how ribbon braid groups can be used to provide groupoid models for the framed little 2 disks operad. We will then show how one uses these groupiod models to show that (homotopy) automorphisms of framed little disks is equivalent to the Grothendieck Teichmüller group.

This talk will not assume familiarity with operads. All work is joint with Geoffroy Horel and Pedro Boavida.