Mittagsseminar zur Arithmetik: Alexander Ivanov (Ruhr-Universität Bochum): Parahoric Deligne--Lusztig induction and Fargues--Scholze parameters of supercuspidals
Tuesday, 28.04.2026 10:15 im Raum SRZ 216/217
First I recall the construction of the p-adic Deligne--Lusztig stack attached to a (quasi-split) p-adic reductive group G/Q_p. The fibers of this stack over Isoc_G are p-adic DL-spaces which in turn contain parahoric DL-varieties. Their cohomology is a source for interesting (smooth) representations (of parahoric subgroups) of G(Q_p).
I will explain two applications to the study of supercuspidal
representations: (1) construction of some new supercuspidals, (2) computation, based on a theorem of T. Feng, of Fargues--Scholze parameters of some supercuspidals. There results are based on several joint works with O. Dudas, S. Nie, P. Tan.
Angelegt am 23.04.2026 von Heike Harenbrock
Geändert am 23.04.2026 von Heike Harenbrock
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Oberseminar Differentialgeometrie: Thomas Munn (Lund University, Sweden): t$(lambda,mu)$-Eigenfunctions on Compact Lie groups
Tuesday, 28.04.2026 11:00 im Raum via zoom
A complex valued function f:(M,g) \to \C$ is said to be a $(\lambda,mu)$-eigenfunction if it is eigen with respect to both the Laplace-Beltrami operator and the conformality operator kappa(f,f) = g(\nabla f,\nabla f). Recent developments have shown that $(\lambda,\mu)$-eigenfunctions can be used in the construction of harmonic morphisms, proper r-harmonic maps, and minimal submanifold of codimension two. There has also been interest in classifying eigenfunctions.
In this talk we consider the case when (M,g) is a compact Lie group equipped with a bi-invariant metric, as the Laplace-Beltrami operator's spectral theory is described by the Peter-Weyl theorem. We use the Peter-Weyl theorem, and other representation theoretic techniques in order to classify all the pairs (\lambda, \mu) as well as describe conditions which ensure the existence of eigenfunctions. Finally, we produce new eigenfunctions on both compact Lie groups G and Riemannian symmetric spaces G/K. This is a joint project with Oskar Riedler.
If you are interested please contact Prof. Dr. Anna Siffert (asiffert@uni-muenster.de)
Angelegt am 17.03.2026 von Anke Pietsch
Geändert am 20.04.2026 von Anke Pietsch
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Julian Kranz: Groupoids, partial actions, and models for Kirchberg algebras. Oberseminar C*-Algebren.
Tuesday, 28.04.2026 16:15 im Raum SRZ 216/217
Partial group actions on spaces by homeomorphisms between open sets provide a rich class of C*-algebras via the crossed product construction. We start an in-depth investigation when a general Hausdorff étale groupoid is a transformation groupoid by a partial action. Our negative results contain the first examples of Hausdorff étale groupoids which do not arise as transformation groupoids of partial group actions and which are not inner amenable in the sense of Anantharaman-Delaroche. On the positive side, we prove that many higher rank graph algebras as well as many unital UCT Kirchberg algebras can be realized via partial group actions. This is joint work with Alcides Buss.
Angelegt am 24.03.2026 von Elke Enning
Geändert am 13.04.2026 von Elke Enning
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Prof. Dr. Mustafa Cevikbas - Artificial Intelligence in Mathematics Education: Promise, Pitfalls, and Empirical Insights from A Mathematical Modelling Perspective
Wednesday, 29.04.2026 14:00 im Raum Johann-Krane-Weg 39
Frank Wübbeling (Uni Münster): Terminal Agents
for Science, Administration and Softward Development
Wednesday, 29.04.2026 14:15 im Raum M5
We introduce command-line assistants as LLM-based systems that can do real work through tools, permissions, and
sandboxed execution environments. We explain how these assistants differ from plain chatbots, opening new
possibilities but also introducing challenges and risks.
The main focus is on existing and possible applications in
our department.
Angelegt am 19.02.2026 von Stephan Rave
Geändert am 16.04.2026 von Frank Wübbeling
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