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  • 5 minutes Lebesgue
    Mar 28, 2017

    Les vidéos des exposés seront mises en ligne quelques jours après l'exposé. Vidéothèque

    Prochain exposé : Rediffusion :

    28-03-2017:  Marc Raynaud La machine de Turing

    Lieu

    Rennes

    Exposés à venir:

    04-04-2017:  Barbara Schapira

    25-04-2017:  Basile Pillet

  • XVI Journées Louis Antoine
    Mar 30, 2017 to Mar 31, 2017

    Statistiques : regret et parcimonie

    Deux mini-cours de 3 heures

    Gilles Stoltz (CNRS, HEC): Bandits stochastiques avec un nombre fini de bras : résultats d'optimalité sur le regret.

    et

    Sara van de Geer (ETH Zürich) :Estimation and testing under sparsity.

    et un exposé complémentaire

    Cyril Lacoste (Université de Rennes 1): Statistiques et sommes de trois carrés.

    Voir le site des JLA

  • School - Flows and Limits in Kähler Geometry
    Apr 18, 2017 to Apr 22, 2017

    Nantes, from April 18th to April 22nd

    Organization board: Sébastien Boucksom, Yann Rollin, Carl Tipler

    Scientific board: Claudio Arezzo, Olivier Biquard, Paul Gauduchon, Michael Singer

    Kähler geometry is a very active research field, at the crossroads between algebraic and Riemannian geometry. Important breakthrough, that lead to solve the Yau-Tian-Donaldson conjecture in the Fano case, have been achieved recently. A spring school involving mini-lectures and talks around this thread of new ideas in Kähler geometry is organized at Nantes University. The goal of the school is to develop certain technical skills, useful to address a variety of important questions in algebraic geometry and global analysis on manifolds, aimed for PhD students and young researchers. Geometric flows, like the Kähler-Ricci flow for instance, and the associated quantification by the Donaldson dynamical system, will be among the essential tools dealt with during the school.

  • Conference - Teichmüller Theory in Higher Dimension and Mirror Symmetry
    Apr 24, 2017 to Apr 28, 2017

    QR-Code

    Angers, from April 24th to April 28th

    Organization board: Frédéric Mangolte, Etienne Mann, Laurent Meersseman, Alexis Roquefeuil

    Teichmüller theory and mirror symmetry are very active domains. In this conference, we propose two series of lectures by two world leader mathematicians :

    • Misha Verbitsky on Teichmüller theory
    • Dimitri Zvonkine, University Pierre et Marie Curie

    Speakers:

    • Gaetan Borot, Max Planck Institut, Bonn
    • Fabrizio Catanese, University of Bayreuth
    • Ekaterina Amerik, University of Orsay (tbc)
    • Maxim Kontsevich, IHES (tbc)
    • Thomas Reichelt, University of Heidelberg
    • Jacopo Stoppa, SISSA
    • Claude Sabbah, Ecole polytechnique
    • Adrien Sauvaget, University Pierre et Marie Curie
    • Andrei Teleman, University of Aix-Marseille
  • Séminaire Quimpériodique
    Jun 1, 2017 to Jun 2, 2017

    Ce séminaire de géométrie, complètement à l'Ouest, réunit à Quimper, trois fois l'an, pour deux journées, le jeudi et le vendredi, des géomètres venus des régions Bretagne et Pays de Loire.

    Programme

    Inas Amacha (LMBA): TBA;
    Vincent Colin (LMJL): TBA;
    Bertrand Deroin (ENS Paris): TBA;
    Victor Kleptsyn (IRMAR): TBA;
    Paul Laurain (univ. Paris VII): TBA.

    Correspondants

    Guillaume Deschamps, LMBA, Brest
    Laurent Meersseman, LAREMA, Angers
    Gaël Meigniez, LMBA, Vannes
    Yann Rollin, LMJL, Nantes
    Frédéric Touzet, IRMAR, Rennes

    Historique

    Historique du séminaire

    Affiche

    Télecharger l'affiche ici

  • Conference - Infinite measure Dynamics
    Jun 6, 2017 to Jun 9, 2017

    Brest, from June 6th to June 9th

    Organization board: Yves Coudène, François Maucourant, Françoise Pène, Barbara Schapira, Samuel Tapie

    Scientific board: Jon Aaronson, Jean-Pierre Conze, Gilles Courtois, Domokos Szasz

    This conference will focus on dynamical systems which naturally preserve a measure with infinite mass. These systems appear in a geometric or probabilistic context, or may come from natural sciences. When the invariant measure has infinite mass, recurrence is no longer automatic, usual mixing properties disappear and new asymptotical properties (such as rationnal ergodicity) may occur. Such systems may develop various and subtil behaviours, which could not exists in finite measure dynamics.

    This conference will gather international experts on this topic, and will allow young researcher to have an easy access to the large recent developpment on such questions.

  • Conference - Families of algebraic dynamical systems
    Jun 12, 2017 to Jun 16, 2017

    Rennes, from June 12th to June 16th

    Organization board: Serge Cantat, Christophe Dupont

    Scientific board: Matthew Baker, Eric Bedford, Serge Cantat, Christophe Dupont, Mattias Jonsson

  • Conference - Random walks on algebraic structures-On honour of Yves Guivarc'h
    Jun 19, 2017 to Jun 23, 2017

    Rennes, from June 19th to June 23rd

    Organization board: Bachir Bekka, Nizar Demni

    Scientific board: Bachir Bekka, Emmanuel Breuillard, Nizar Demni, Alex Lubotzky

    The conference deals with themes around random walks on algebraic structures. Dynamical sytems on groups, homogeneous spaces, and related structures (graphs, quantum groups , groupoids,...) are rich objects, involving various fields of mathematics (probability, group theory, topology, number theory, operator algebras, Banach space geometry, etc). They are also useful as modelling tools for other sciences (physics, computer science, economics, etc); for instance, expander graphs, which are of interest in theoretical computer science, are graphs for which the associated random walk has special spectral properties and their explicit construction involves sophisticated tools such as Kazhdan's property (T) or Selberg's inequality. The conference aims to give a flavor of the various aspects of the subject by bringing together some experts with major contributions to the field. This conference will also be the opportunity to celebrate the 80th birthday of Yves Guivarc'h, who played a major part in the development of probability on algebraic and geometric structures, a subject with an ever growing interest for the last 30 years.

Organisation

About Lebesgue Center

Administration

  • Xhensila Lachambre, Administrative Coordinator
  • Stéphanie Benoit, Assistant Director of LMJL, Nantes
  • Emmanuelle Guiot, Administrative Assistant, Rennes

Executive Advisory Board

Previous member of the Executive Advisory Board

Scientific Committee

The Scientific Advisory Board defines and delimits the scientific and financial policy and is responsible for the major scientific decisions of the Lebesgue Center. The Scientific Advisory Board will meet every four months.

Members of the Scientific Advisory Board

Albert Benveniste, representative of Inria and Cominlabs
Philippe Carmona, LMJL, Université de Nantes
Gilles Carron, director of LMJL, Université de Nantes
Loïc Chaumont, LAREMA, Université d'Angers
Vincent Colin, LMJL, Université de Nantes
Jean-François Coulombel, LMJL, Université de Nantes
Arnaud Debussche, Irmar, l'ÉNS Rennes
Christophe Dupont, responsible of M2 research on the UR1
Jean-François Dupuy, Irmar, INSA Rennes
Vincent Guirardel, Irmar, Université de Rennes 1
Benoît Grébert, LMJL, Université de Nantes
Frédéric Hérau, responsible of M2 research on the Université de Nantes
Florian Ivorra, Irmar, Université de Rennes 1
Xhensila Lachambre, coordinatrice of Lebesgue Center
Yves Laszlo, ÉNS Paris
Mohammed Lemou, Irmar, Université de Rennes 1 et l'ÉNS Rennes
Anna Lenzhen, Irmar, Université de Rennes 1
Roger Lewandowski, Irmar, Université de Rennes 1
Quansheng Liu, LMBA, Université de Bretagne Sud
Marine Malo Fontaine, representative of Irmar' PhD students
Frédéric Mangolte, director of LAREMA, Université d'Angers
Florian Méhats, director of Irmar
Olivier Pierre, representative of LMJL'PhD
Christophe Ritzenthaler, Irmar, Université de Rennes 1
Miguel Rodrigues, Irmar, Université de Rennes 1
Benoît Saussol , director of LMBA, Université de Bretagne Atlantique
Tobias Schmidt, Irmar, Université de Rennes 1
Frédéric Touzet, Irmar, Université de Rennes 1
Olivier Thom, representative of Irmar' PhD students

Previous Members of the Scientific Advisory Board

Bachir Bekka, Julie Bessac, Christophe Biscio, Jean-Christophe Breton, Guy Casale, Gilles Durrieu Laurent Guillopé, Hélène Hivert, Marie Kopec, Guillaume Leboucher, David Lubicz, Nicolas Popoff, Ophélie Rouby
San Vũ Ngọc

International Scientific Orientation Board

The International Scientific Board will oversee the scientific directions of the Center, ensure its overall excellence and preside over regular exterior evaluations. It will meet during the setup of the Center and then every two years.

Members of the International Scientific Board

Martin Hairer, University of Warwick
Daniel Huybrechts, University of Bonn
José Rafael León, University of Venezuela
Christian Lubich, University of Tübingen
Nader Masmoudi, University of New York
Alan Weinstein, University of California, Berkely
Maciej Zworski, University of California, Berkeley

Socio-Economic Orientation Board

The Socio-Economic Orientation Board advises the Lebesgue Center actions related to the socio-economic world and in relation to cities policy. It meets annually.

Members of the Socio-Economic Orientation Board

This board is composed by representatives of Irmar and LMJL' tutelles, Bretagne and Rennes's métropole, Pays de la Loire et Nantes's métropole, representatives of Bretagne and Pays de la Loire' DRRT also, three Industrial Partners, one representative of AMIES, and one representative of SATT Ouest Valorisation.

Partners

Irmar LMJL ENS Rennes LMBA LAREMA

Affiliation

ANR CNRS Rennes 1 Rennes 2 Nantes INSA Rennes INRIA ENSRennes UBO UBS Angers UBL