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  • Veranstaltungen am Mathematischen Institut

    20
    Apr
    2026

    Maxime Ramzi (Münster): Free rigid categories and applications. Oberseminar Topologie.

    Symmetric monoidal categories are a fundamental object in many areas of mathematics, and among those, *rigid* categories - that is, those where every object adm...

    21
    Apr
    2026

    Hanfeng Li (Chongqing University): Permanents and restricted permutations. Oberseminar C*-Algebren.

    The permanent of a square matrix is defined similar to its determinant, without signs on the products of entries. I will introduce a notion of permanent for ele...

    14
    Apr
    2026

    Andrea Vaccaro (Lyon): Various degrees of tracial divisibility. Oberseminar C*-Algebren.

    The modern theory of simple tracial C*-algebras is characterized by a rich collection of divisibility conditions, coming in numerous flavours and levels of stre...

    27
    Apr
    2026

    Ferdinand Wagner (Münster): tba. Oberseminar Topologie.


    28
    Apr
    2026

    Julian Kranz: Groupoids, partial actions, and models for Kirchberg algebras. Oberseminar C*-Algebren.

    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-dep...

    04
    May
    2026

    Baylee Schutte (Freie Universität Berlin): tba. Oberseminar Topologie.


    05
    May
    2026

    Adriana Fernandez i Quero (Leuven): Non-amenable C*-superrigid groups that are not W*-superrigid. Oberseminar C*-Algebren.

    In this talk, I will recall the notions of C*- and W*-superrigidity for groups. I will then present examples of non-amenable groups that can be completely reco...

    11
    May
    2026

    Sil Linskens (Regensburg): A 2-categorical approach to building six functor formalisms. Oberseminar Topologie.

    The idea of six functors formalisms originates in Grothendieck's work on duality for étale cohomology of schemes. Much more recently, a simple and powerful defi...
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