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Our seminar runs on Tuesdays from 13:00 to 14:00, unless under exceptional circumstances. During the Spring semester of 2026 the seminar always takes place in the IMADA Conference Room.
Contact: Matteo Pagliero - pagliero@imada.sdu.dk
9/12/2025: Andrew Toms (Purdue University), at 13:00 in U164.
Title: Homotopy groups of Cuntz classes in C*-algebras
Abstract: The Cuntz semigroup of a C*-algebra A consists of equivalence classes of positive elements, where equivalence means roughly that two positive elements have the same rank relative to A. It can be thought of as a generalization of the Murray von Neumann semigroup to positive elements and is an incredibly sensitive invariant. We give a brief introduction to this object and its relevance to the classification theory of separable nuclear C*-algebras. We then present a calculation of the homotopy groups of these Cuntz classes as topological subspaces of A when A is classifiable in the sense of Elliott.
16/12/2025: Joachim Zacharias (University of Glasgow), at 13:00 in U164.
Title: TBA
Abstract: TBA
3/02/2026: Larissa Kroell
Title: TBA
Abstract: TBA
10/02/2026: Gilles De Castro (Federal University of Santa Catarina)
Title: TBA
Abstract: TBA
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