Institut de Mathématiques de Marseille, UMR 7373




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21 juin 2019: 4 événements

Séminaire

  • Agenda ERC IChaos

    Du 9 au 22 juin - Alexander BUFETOV & Dmitry ZUBOV

    Research in Pairs & scientific collaboration with Math. Department of University of Cagliari

    Résumé : QUANTITATIVE MIXING AND FINITELY-ADDITIVE MEASURES ON STABLE FOLIATIONS OF ANOSOV DIFFEOMOPHISMS
    Anosov diffeomorphisms are well-known to be strongly mixing.
    It nonetheless remains a challenge to find effective quantitative bounds on the rate of
    mixing for Anosov diffeomorphisms in higher dimension.
    The aim of this collaboration is to use the formalism of holonomy-invariant
    finitely-additive measures on stable foliations of Anosov diffeomorphisms in order to find an effective asymptotic expansion for the equidistribution of their stable leaves.

    Lieu : Hôtel flamingo & University of Cagliari - Sardaigne, Italy

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  • Agenda ERC IChaos

    Du 15 au 21 juin - Adrien BOULANGER

    Scientific collaboration with Math. department (and Gilles COURTOIS)

    Résumé : discussions around Cheeger’s inequality for differential forms

    Lieu : Institut de Mathématiques de Jussieu - Paris

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  • Séminaire Teich

    Vendredi 21 juin 11:15-12:15 - Jean-François QUINT - Institut de Mathématiques de Bordeaux

    Trou spectral en théorie des groupes

    Résumé : Je présenterai plusieurs problèmes reliés à la question du calcul du rayon spectral d’opérateurs apparaissant naturellement en théorie des groupes.

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    Jean-Francois QUINT

    Lieu : FRUMAM - Aix-Marseille Université - Site St Charles
    3, place Victor Hugo - case 39
    13331 MARSEILLE Cedex 03

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  • Séminaire Signal et Apprentissage

    Vendredi 21 juin 14:00-15:00 - Jean-Christophe PESQUET - CentraleSupélec, Paris

    Deep neural networks and variational inequalities

    Résumé : Motivated by structures that appear in deep neural networks, we investigate nonlinear composite models alternating proximity and affine operators defined on different spaces. We first show that a wide range of activation operators used in neural networks are actually proximity operators. We then establish conditions for the averagedness of the proposed composite constructs and investigate their asymptotic properties. It is shown that the limit of the resulting process solves a variational inequality which, in general, does not derive from a minimization problem. The analysis relies on tools from monotone operator theory and sheds some light on the asymptotic properties of a class of neural networks structures.

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    Jean-Christophe PESQUET

    Lieu : CMI, salle de séminaire R164 (1er étage) - I2M - Château-Gombert
    39 rue Frédéric Joliot-Curie
    13453 MARSEILLE cedex 13

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  • 21 juin 2019: 2 événements

    Manifestation scientifique

    • Manifestations scientifiques (colloques, écoles,...)

      Du 10 au 21 juin - INTERNATIONAL CONFERENCE

      Probability and quantum field theory : discrete models, CFT, SLE and constructive aspects

      Résumé : INTERNATIONAL CONFERENCE,
      -
      Topics :
      - Conformal field theories : probabilistic and algebraic aspects
      - Constructive quantum field theory (path integral, regularity structures,...)
      - Discrete models of statistical mechanics (percolation, Ising, FK model,...)
      - SLE/CLE theory
      - Random planar maps
      - 2d quantum gravity
      -
      The conference includes 5 mini-courses (3h each) :
      - Vincent Beffara - Damien Gayet : random nodal lines
      - Jeremie Bouttier : Schur processes and free fermions
      - Alexey Litvinov : Liouville conformal blocks and the AGT conjecture
      - Xin Sun : Liouville quantum gravity as mating of trees
      - Alessandro Vichi : 3d conformal bootstrap
      -
      Organizers :
      - Christophe Garban (Université Lyon 1, France)
      - Rémi Rhodes (I2M, université Aix-Marseille, France)
      - Vincent Vargas (Ecole Normale Supérieure de Paris, France)
      -
      Sponsors :
      - Agence Nationale de la Recherche (ANR)
      - Centre National de la Recherche Scientifique (CNRS)
      - European Research Council (ERC)
      -

      Website
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      Autre lien : IGESA

      Lieu : Île de Porquerolles - Hôtel Club Igesa
      Rue de la Douane
      84300 Hyères
      France

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    • Manifestations scientifiques (colloques, écoles,...)

      Du 17 au 21 juin - INTERNATIONAL CONFERENCE

      Aspects of Non-Positive and Negative Curvature in Group Theory

      Résumé : INTERNATIONAL CONFERENCE,
      -
      This conference will focus on applications of non-positive and negative curvature to geometric group theory. The most well known examples of this are δ-hyperbolic and CAT(0)-groups. More recently, some of the techniques that have been used to study these groups have been imported to study groups that have some features of negative curvature but aren’t themselves negatively curved. For example, the mapping class group is neither δ-hyperbolic nor CAT(0) but major progress has been obtained in on our understanding of this group by studying its action on the δ-hyperbolic curve complex. A related group is Out(Fn), the group of automorphisms of the rank n free group and similar program is underway to understand it. More generally, large classes of groups have been identified that have certain features of negative curvature and this has been exploited to prove results which were heretofore only known in special cases. This conference will bring together a distinguished international group of mathematicians to report on current work and to explore future directions in this active and expanding area of research.
      The conference will also be an opportunity to celebrate the Mladen Bestvina’s contributions to mathematics.
      -
      Speakers :
      - Yael Algom-Kfir (University of Haifa)
      - Martin Bridson (University of Oxford)
      - Indira Chatterji (Université Nice Sophia Antipolis)
      - Matt Clay (University of Arkansas)
      - Mark Feighn (Rutgers-Newark University)
      - Koji Fujiwara (Kyoto University)
      - Vincent Guirardel (Université de Rennes 1)
      - Ursula Hamenstädt (Rheinische Friedrich-Wilhelms-University Bonn)
      - Camille Horbez (CNRS / Université Paris-Sud)
      - Kasia Jankiewicz (University of Chicago)
      - Fanny Kassel (CNRS / IHES)
      - Ian Leary (University of Southampton)
      - Lars Louder (University College London)
      - Frédéric Paulin (Université Paris-Sud)
      - Beatrice Pozzetti (Heidelberg University)
      - Piotr Przytycki (McGill University)
      - Eliyahu Rips (The Hebrew University of Jerusalem)
      - Zlil Sela (The Hebrew University of Jerusalem)
      - Alessandro Sisto (ETH Zurich)
      - Juan Souto (Université de Rennes 1)
      - Karen Vogtmann (University of Warwick)
      - Shmuel Weinberger (University of Chicago)
      -
      Organizers :
      - Kenneth Bromberg (University of Utah)
      - Arnaud Hilion (I2M, Aix-Marseille Université)
      - Ilya Kazachkov (IKERBASQUE. Basque Foundation for Science)
      - Michah Sageev (Technion - Israel Institute of Technology)
      - Jing Tao (University of Oklahoma)
      -
      Sponsors :
      - ANR DAGGER
      - Centre International de Rencontres Mathématiques (CIRM)
      - European Research Council (ERC)
      - Institut de Mathématiques de Marseille (I2M)
      - LabEx Archimède
      - National Science Foundation (NSF)
      -

      Website
      JPEG - 22.8 ko

      Autre lien : CIRM

      Lieu : CIRM - 163 avenue de Luminy
      Case 916
      13288 MARSEILLE - Cedex 9
      France

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