Speaker: Dr Konstantin Jakob
Affiliation: Technische Universitat Darmstadt


The Deligne-Simpson problem asks for a criterion for the existence of a connection on a punctured P^1 with prescribed singularities. I will explain joint work with Zhiwei Yun on a generalization of this problem for G-connections on P^1 with two singularities, only one of which is a regular singularity, where G is any complex reductive group. We give a geometric and a representation-theoretic existence criterion, and use them to solve the Deligne-Simpson problem in many cases.

About Pure mathematics seminars

We present regular seminars on a range of pure mathematics interests. Students, staff and visitors to UQ are welcome to attend, and to suggest speakers and topics.

Seminars are usually held on Tuesdays from 2 to 3pm.

Talks comprise 45 minutes of speaking time plus five minutes for questions and discussion.

Information for speakers

Researchers in all pure mathematics fields attend our seminars, so please aim your presentation at a general mathematical audience.

Contact us

To volunteer to talk or to suggest a speaker, email Ole Warnaar or Ramiro Lafuente.


Physics Annexe (06)
Room: 407