Laboratoire de Mathématiques de Besançon - UMR 6623 CNRS
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Les événements de octobre 2020

Séminaire

  • Analyse Numérique et Calcul Scientifique

    • Jeudi 1er octobre 11:00-12:00 - Hugo MARTIN - INSERM et Paris Sud

      Séminaire ANCS : Hugo MARTIN

      Résumé : Periodic asymptotic dynamics of the measure solutions to a growth-fragmentation equation in a critical case
      In the last years, measure solutions to PDE, in particular to model populations, have drawn much attention. The talk will be devoted to the presentation of a recent, unusual result in this field, that we obtained with Pierre Gabriel.
      First, I will expose some wellposedness and asymptotic results for two famous population equations in the L^p and measure frameworks, and explain the critical case that interested us. Then, I will define the notion of solution we used, and if needed, recall some basic definitions about semigroups.
      Moving to the proof itself, I will present the main steps of the proof of the wellposedness of the problem, that relies on a duality relation used to build a solution expressed as a semigroup acting on an initial measure. Then, I will go a little more into details of the demonstration of the asymptotic behaviour, namely a convergence in total variation norm toward an oscillating measure.

      Lieu : Salle 316Bbis - Laboratoire de Mathématiques
      Université de Franche-Comté
      16 route de Gray
      25030 Besançon CEDEX
      FRANCE

      Article

  • Analyse Fonctionnelle

    • Mardi 6 octobre 13:45-15:00 - Jean-Christophe Bourin - LMB

      Une décomposition pour les matrices partitionnées

      Notes de dernières minutes : On établit "un théorème de Pythagore" pour les matrices partitionnées qui entraîne de nombreuses inégalités.

      Article

    • Mardi 20 octobre 13:45-15:00 - Jonas Wahl - Bonn

      Markov dynamics on branching graphs of diagram algebras

      Résumé : Thoma’s famous theorem on the classification of characters on
      the infinite symmetric group has been very influential in different
      areas of mathematics such as combinatorics and probability theory. In
      this talk, we explain versions of Thoma’s theorem for different diagram
      algebras arising out of subfactor theory and Banica and Speicher’s
      theory of easy quantum groups. As Thoma’s classical theorem, these
      results can be formulated in a probabilistic language and we find
      interesting new connections to random lattice paths and random walks on
      trees.

      Article

Colloque / Journée

  • Département de Mathématiques

    • Mercredi 21 octobre 18:30-21:00 -

      Concert "Musique et mathématiques" : Again the sunset.

      Lieu : Petit Kursaal de Besançon, 2 place du Théâtre

      Article

Réunion

  • LMB

    • Vendredi 9 octobre 12:30-14:00 -

      Conseil scientifique

      Lieu : Salle 316B

      Article

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