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Veranstaltungskalender

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  • Dezember
  • 12. Dezember
    17:15 - 18:30
    Ort: Raum 48-210
    Fachbereich

    Prof. Dr. Peter Benner, MPI -Magdeburg, "Feedback Stabilization of Unsteady Flow Problems"

    Optimizing a trajectory of any unsteady problem in practice requires a
    feedback strategy in order to attenuate disturbances, e.g., external
    influences or unmodeled dynamics, that would lead to a deviation from
    the desired, and possibly optimized, path. In this talk, we consider the
    unsteady incompressible 2D Navier-Stokes equations and discuss their
    feedback stabilization using Riccati-type controllers based on the
    Dirichlet boundary control problem for the flow field. Numerical
    methods to solve the resulting large-scale, descriptor-type algebraic
    Riccati equations will be discussed. Their performance will be
    illustrated by numerical experiments.

  • 01. Dezember
    13:30 - 15:00
    Ort: 48-210
    Graduate School

    Wlazlo, Jaroslaw: Elastic Image Registration with Strong Mass Preserving Constraints

  • November
  • 23. November
    17:00 - 18:00
    Ort: 48-436
    AG Algebra, Geometrie und Computer Algebra

    Reda Chaneb, Université Paris Diderot: Basic sets for unipotent blocks of finite reductive groups

    Let G(q) be a finite group of Lie type and l be a prime number not dividing q. Geck and Hiss have proved that, if l is good, the restriction of unipotent characters to l-regular elements is a basic set for unipotent blocks of G(q). When l is bad, there are usually not enough unipotent characters to form a basic set. An alternative strategy to get a basic set is to construct projective characters satisfying some properties. For classical groups with connected center and l=2, by using a family of projective representations constructed by Kawanaka, Geck proved the existence of a basic set such that the decomposition matrix of the unipotent block has a unitriangular shape for this basic set. I will introduce those results and present generalizations of the results of Geck for the case of groups with disconnected center.

  • 16. November
    17:00 - 18:00
    Ort: 48-436
    AG Algebra, Geometrie und Computer Algebra

    Olivier Dudas, Université Paris Diderot: On the unitriangular shape of decomposition matrices for finite reductive group

    In order to classify the unipotent characters of finite reductive groups, Kawanaka constructed a family of representations induced from 'almost' unipotent groups, and conjectured a multiplicity formula for the unipotent constituents of these representations. I will explain how one can prove this formula providing some mild assumptions on unipotent classes. This can be used to show that the decomposition matrices of unipotent blocks have unitriangular shape. This is a joint work with O. Brunat and J. Taylor.

  • 14. November
    17:15 - 18:30
    Ort: Raum 48-210
    Fachbereich Mathematik

    Prof. Dr. Henning Krause, Universität Bielefeld, "Classifying modular representations "

    It is a basic and classical problem in modular representation theory to classify the indecomposable representations of a finite group. In my talk, I will explain this problem from a historical perspective. Then I discuss the more recent development which involves the notion of cohomological support, eventually leading to a connection to Grothendieck's local duality.

  • 02. November
    17:00 - 18:00
    Ort: 48-436
    AG Algebra, Geometrie und Computer Algebra

    Caroline Lassueur: Lifting Morita equivalences with an endo-permutation source

    Motivated by current work of Boltje-Kessar-Linckelmann on the Picard group of Morita self-equivalences with endo-permutation source, we consider the problem of whether Morita equivalences with an endo-permutation source are liftable from positive characteristic to characteristic zero in general. The first part of the talk will give a gentle introduction to the concepts of vertices, sources and multiplicity modules in modular representation theory, while the second part of the talk will focus on the aforementioned lifting problem.

  • Oktober
  • 27. Oktober
    13:30 - 15:00
    Ort: 48-208
    Graduate School

    Coskun, Sema: Application of the Heath-Platen Estimator in pricing barrier and bond options

  • 26. Oktober
    17:00 - 18:00
    Ort: 48-436
    AG Algebra, Geometrie und Computer Algebra

    Andrew Mathas (University of Sydney): Jantzen filtrations and graded Specht modules

    The Jantzen sum formula is a classical result in the representation theory of the symmetric and general linear groups that describes a natural filtration of the Specht modules over any field. Analogues of this result exist for many algebras including the cyclotomic Hecke algebras of type A. Quite remarkably, the cyclotomic Hecke algebras of type A are now know to admit a Z-grading because they are isomorphic to cyclotomic KLR algebras. I will explain how to give an easy proof, and stronger formulation, of Jantzen sum formula for the cyclotomic Hecke algebras of type A using the KLR grading. I will discuss some consequences and applications of this approach.

  • 23. Oktober
    14:30 - 16:00
    Ort: Fraunhofer ITWM, Raum Z03.07/08
    Graduate School

    Easwaran, Prakash: Stochastic geometry models for interacting fibers

  • 19. Oktober
    14:00 - 15:30
    Ort: 48-208
    Graduate School

    Rodriguez Cruz, Yolanda Rocio: Model Order Reduction for Stochastic and Bilinear Systems

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