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  • Events at the Mathematical Institute

    20
    Oct
    2025

    Akhil Mathew (University of Chicago): Sheared Witt vectors (after V. Drinfeld, E. Lau, and T. Zink)

    Abstract: Motivated by Dieudonné theory, V. Drinfeld and E. Lau introduced a "decompletion" of the ring of Witt vectors W(R) of a derived p-complete ring R su...

    27
    Oct
    2025

    Guido Arnone (Universidad de Buenos Aires): K-theory of étale groupoids

    Abstract: For an étale topological groupoid, we consider a dualisable category of sheaves associated to it and study its K-theory. In the case of groupoids ar...

    28
    Oct
    2025

    Boris Bilich (Haifa): Higher categories for classification of C*-algebras. Oberseminar C*-Algebren.

    In broad terms, classification in mathematics means finding a clear and useful way to describe the isomorphism classes of a given category, such as those of fi...

    03
    Nov
    2025

    Georg Lehner (Universität Münster): On Verdier Duality

    Abstract: Recent progress on the K-theory of "large" categories has raised interest in the algebraic K-theory of sheaves on locally compact Hausdorff spaces, ...

    04
    Nov
    2025

    Ralf Meyer (Göttingen): tba. Oberseminar C*-Algebren.


    10
    Nov
    2025

    Matthias Ludewig (Universität Greifswald): Generalized Kitaev Pairings in coarse geometry

    Abstract: In Appendix C of his "Anyons" paper, Kitaev introduced the notion of a "generalized Chern number" for a 2-dimensional system by diving the system in t...

    18
    Nov
    2025

    Walter van Suijlekom (Nijmegen): A generalization of K-theory to operator systems. Oberseminar C*-Algebren.

    We propose a generalization of K-theory to operator systems. Motivated by spectral truncations of noncommutative spaces described by C*-algebras and inspired by...

    25
    Nov
    2025

    Tattwamasi Amrutam (Warsaw): tba. Oberseminar C*-Algebren.

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