Thematic trimester programme with short courses, seminars and workshops
September 14th to December 4th, 2026 at the Institut Henri Poincaré, Paris
REGISTRATION IS FREE AND MANDATORY
Click here to register for the trimester
IMPORTANT WARNING: Scam / Phishing / SMiShing ! Note that ill-intentioned people may be trying to contact some of participants by email or phone to get money and personal details, by pretending to be part of the staff of the conference center. IHP and the organizers will NEVER contact you by phone on this issue and will NEVER ask you to pay for accommodation/ board / possible registration fee in advance.
Deadline for financial support request is March 15, 2026
Operator algebras are self-adjoint subalgebras of the bounded operators on a Hilbert space and divide into two main classes: C∗-algebras and von Neumann algebras, according to whether one demands that they are closed in the norm topology or the weak operator topology. When one first meets these algebras, they might look quite similar, but they have different natures as exemplified by the commutative case: via the Gelfand transform, abelian C∗-algebras are algebras of continuous functions vanishing at infinity on a locally compact Hausdorff space, while abelian von Neumann algebras are essentially bounded measurable functions on a measure space. These flavours persist in general. Topological concepts such as dimension and invariants such as K-theory pervade the study of C∗-algebras, while measure-theoretic style methods are often used to study von Neumann algebras.
Introductory school:
September 14th to 18th, 2026 — Operator Algebras and interactions at IESC (Cargèse)
The introductory school will feature four mini-courses. The standard format will be four 1h long lectures for each mini-course.
- Yves Benoist (CNRS & Université Paris-Saclay)
- Shirly Geffen (University of Münster)
- Amine Marrakchi (CNRS & Ecole normale supérieure de Lyon)
- William Slofstra (University of Waterloo)
A separate (free) registration is needed for the school:
Link to registration
Workshops:
September 28 to October 2 — Workshop 1 - Operator Algebras: Groups and Dynamics
October 26 to 30 — Workshop 2 - Operator Algebras: Matricial Approximations
November 30 to December 4 — Workshop 3 - Operator Algebras: Rigidity and Classification
Lecture series:
Lecture series will be held in amphitheater Darboux in IHP. The standard format will be three 2h long lectures during one week for each lecture series.
- Adrian Ioana (University of California at San Diego): Week of September 21
- Uri Bader (University of Maryland): Week of October 5
- Tatiana Shulman (Chalmers University of Technology): Week of October 12
Organising committee:
- Cyril Houdayer (Ecole normale supérieure)
- Mikael de la Salle (CNRS, Université Claude Bernard Lyon 1)
- Stuart White (University of Oxford)
Scientific committee:
- Nadia Larsen (University of Oslo)
- Magdalena Musat (University of Copenhagen)
- Gilles Pisier (Sorbonne Université, Académie des Sciences)
- Stefaan Vaes (KU Leuven)
Back to the thematic trimester main page
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Programme coordinated by the Centre Emile Borel at IHP
Sorbonne Université, CNRS