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Copenhagen
We meet on Wednesdays from 15:15 to 16:15. If you have any questions about the seminar or want to be added to the email list, please contact one of the organizers:
11/02/2026, Auditorium 10
Gilles de Castro (Federal University of Santa Catarina)
Title: Continuous orbit equivalence for partial dynamical systems
Abstract: Given a partial dynamical system, one can construct its transformation groupoid. We characterize when two transformation groupoids are isomorphic in terms of the continuous orbit equivalence of their corresponding partial dynamical systems. Under certain additional conditions, the isomorphism between these groupoids is also characterized via the isomorphism of their corresponding crossed products. Furthermore, we provide several necessary and sufficient conditions for a groupoid to be isomorphic to a transformation groupoid, and apply our results to the case of orthogonal and saturated partial actions. (Joint work with Eun Ji Kang)
12/02/2026, Auditorium 8
Ilijas Farah (York University)
Note: This is the second seminar of the week and takes place on Thursday at 15:15.
Title: Tracial Transfer
Abstract: Tracially complete C*-algebras are a generalization of Ozawa's W*-bundles introduced by J.Carrión--Castillejos--Evington--Gabe--Schafhauser--Tikuisis--White as a vehicle for transferring ideas and results about (tracial) von Neumann algebras to C*-algebras. This transfer can be achieved in a uniform way, and that is what this talk will be about. This is a joint work with Hart, Hirshberg, Schafhauser, Tikuisis, and Vaccaro.
18/02/2026, Auditorium 10
Gregory Patchell (Oxford University)
Title: TBA
Abstract: TBA
25/02/2026, TBA
Ingrid Daubechies (Duke University)
Note: This is the Harald Bohr Lecture.
Title: TBA
Abstract: TBA
04/03/2026, Auditorium 10
Ivan Todorov (University of Delaware)
Title: TBA
Abstract: TBA
05/03/2026, TBA
Mahya Ghandehari (University of Delaware)
Note: This is the second seminar of the week and takes place on Thursday at 15:15.
Title: TBA
Abstract: TBA
20/03/2026, Auditorium 4
GOAq Day (Eric Carlen, Vern Paulsen, Jesse Peterson, Dimitri Shlyakhtenko, Walter van Suijlekom)
Note: The event takes place on Friday, from 10:00-18:00.
Titles and Abstracts: TBA
TBA
25/03/2026, Auditorium 8
Milan Donvil (ENS Paris)
Title: TBA
Abstract: TBA
15/04/2026, Auditorium 7
Douglas Farenick (University of Regina)
Title: TBA
Abstract: TBA
29/04/2026, TBA
Urs Lang (ETH Zürich)
Title: TBA
Abstract: TBA
06/05/2026, TBA
Anders Karlsson (Uppsala University)
Title: TBA
Abstract: TBA
10/06/2026, TBA
Goulnara Arzhantseva (University of Vienna)
Title: TBA
Abstract: TBA
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