4/1814:15

Vincent Delecroix (LaBRI/MPI Bonn)

4/2514:15

Giulia Codenotti (FU Berlin)

5/914:15

Michael Cuntz (Univ. Hannover)

Title: Classification of Weyl groupoids

Abstract: Finite Weyl groupoids (these are certain simplicial arrangements in a lattice) were completely classified in a series of papers by Heckenberger and myself. However, this classification is based on two computer proofs checking millions of cases. In this talk, I want to report on recent progress in finding a shorter proof. In particular, we prove without using a computer that, up to equivalence, there are only finitely many irreducible finite Weyl groupoids in each rank greater than two.

5/1614:15

Volkmar Welker (Philipps-Univ. Marburg)

5/2314:15

Davide Bolognini (Univ. Bologna)

5/3014:15

No Seminar (Himmelfahrt)

6/614:15

Cesar Ceballos (Univ. Wien)

6/1314:15

Katharina Jochemko (KTH)

6/2014:15

Jose Samper (MPI Leipzig)

6/2714:15

No Seminar (Due to the BGSMath--BMS Joint Meeting)

7/414:15

Rekha Thomas (Univ. Washington)

7/1114:15

Madeline Brandt (Berkeley/Leipzig)