Orateur: Stefan
Friedl (Regensburg)
Titre: The Thurston norm
for 3-manifolds with a 2-generator 1-relator group.
Résumé:
If the fundamental group of a 3-manifold admits a presentation with
two generators and one relator we will show that one can obtain the Thurston
norm, i.e. the minimal complexity of embedded surfaces, directly from the
presentation. This is based on work with Kevin Schreve and Stephan Tillmann.