Masterclass: Infinity Operads and Applications to Geometry

University of Copenhagen
11-15 August 2025

This masterclass aims to introduce the participants to infinity operads and showcase some applications to algebraic and geometric topology. The masterclass will consist of three lecture series by Rune Haugseng, Marcy Robertson, and Tashi Walde. This will be accompanied by informal exercise sessions and contributed talks from the participants.

Contributed talks are 30 minutes each (25 min talk + 5 min questions). The topic of such a contributed talk should be vaguely related to operads.

We will livestream the lecture series (and not the contributed talks) for participants who may not be able to attend in person. Registration is necessary to attend the masterclass online.

Lecturers/Invited speakers

Rune Haugseng (NTNU Trondheim): Introduction to Infinity Operads
Marcy Robertson (University of Melbourne): Infinity Operads and Variations on Grothendieck-Teichmüller Theory
Tashi Walde (University of Regensburg): Assembly of Constructible Factorization Algebras

Programme

TBA

Venue and transportation

The conference/masterclass will take place at the Department of Mathematical Sciences, University of Copenhagen. See detailed instructions on how to reach Copenhagen and the conference venue.

Tickets and passes for public transportation can be bought at the Copenhagen Airport and every train or metro station. You can find the DSB ticket office on your right-hand side as soon as you come out of the arrival area of the airport. DSB has an agreement with 7-Eleven, so many of their shops double as selling points for public transportation.

A journey planner in English is available.

More information on the "find us" webpage.

Accommodation

We kindly ask the participants to arrange their own accommodation.

We recommend Hotel 9 Små Hjem, which is pleasant and inexpensive and offers rooms with a kitchen. Other inexpensive alternatives are Steel House Copenhagen (close to city centre), and CabInn, which has several locations in Copenhagen: the Hotel City (close to Tivoli), Hotel Scandinavia (Frederiksberg, close to the lakes), and Hotel Express (Frederiksberg) are the most convenient locations; the latter two are 2.5-3 km from the math department. Somewhat more expensive – and still recommended – options are Hotel Nora and Ibsen's Hotel.

An additional option is to combine a stay at the CabInn Metro Hotel with a pass for Copenhagen public transportation (efficient and reliable). See information about tickets & prices.