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  • 5 minutes Lebesgue
    Sep 26, 2017

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

    Prochain exposé :

    26-09-2017Roger Lewandowski
    N raisons d'adhérer à la SMAI où N tend vers l'infini

    Lieu

    Rennes

    Exposés à venir:

    10-10-2017:  Présentation des Annales Henri Lebesgue

    17-10-2017:  Rémi Coulon

    07-11-2017:  Guy Casale

    21-11-2017:  Marine Fontaine

  • Conference - Geometric Analysis at Roscoff
    Oct 9, 2017 to Oct 13, 2017

    Roscoff, from October 9th to October 13th

    Organization board: Paul Baird, Gilles Carron, Ali Fardoun, Carl Tipler

    Scientific board: Gérard Besson (CNRS, Institut Fourier), Olivier Biquard (ENS Paris), Ahmad El Soufi (Univ. Tours)

    Geometric Analysis is the application and development of PDE tools and technics in Riemannian geometry, it is also a fundamental tool in mathematical physics. Recently, important conjectures has been solved: Poincaré's conjecture, Willmore's conjecture, Lawson's conjecture, Yau-Tian-Donaldson's conjecture and a lot of new tools has been introduced and developed : optimal transport, weak formulation of Ricci curvature, Geometric measure theory. This conference will be an opportunity for specialists from theses different areas to meet and exchange ideas, questions and knowledge.

  • Conference - Lebesgue PHD meeting 2017
    Oct 16, 2017 to Oct 18, 2017

    Rennes, from October 16th to October 18th

    Organization board: Grégory Boil, Valentin Doli, Caroline Robet, Jérôme Spielmann

    Scientific board: Solène Bulteau, Clément Rouffort, Nasab Yassine

    Depuis trois ans, le Centre Henri Lebesgue soutient les Rencontres doctorales Lebesgue, initiative des doctorants du Labex. Il s'agit de trois journées de conférences durant lesquelles la parole est donnée à des doctorants de tout horizon géographique et mathématique. L'objectif est ainsi de présenter un panel le plus large possible de la recherche mathématique actuelle telle qu'elle est vue et vécue par les doctorants, mais pas seulement... Lors de ces rencontres, trois chercheurs, appelés 'parrains' de l'évènement, sont invités à exposer et ainsi à partager leur expérience personnelle de la recherche d'aujourd'hui. Cette année, les rencontres sont parrainées par :

    Jean-Marc Bardet (SAMM, Université Paris 1);

    Jasmin Raissy (Institut mathématique de Toulouse, Université Paul Sabatier);

    Gabriel Rivière (Laboratoire Paul Painlevé, Université de Lille 1).

    Bien que principalement destinée aux doctorants, cette conférence se veut également accessible aux étudiants de M2 désireux d’avoir un aperçu des travaux auxquels une thèse en mathématiques peut mener. Pour les doctorants désireux d'exposer leurs travaux de recherche, il est également possible de déposer une proposition sur l'onglet 'Proposer un Exposé'. Dans un souci d'organisation, merci de vous inscrire à l'évènement même si vous proposez un exposé.

  • XVII Journées Louis Antoine
    Oct 19, 2017 to Oct 20, 2017

    Nombres et aléas

    Deux mini-cours de 3 heures

    Yann Bugeaud (Strasbourg): Sur l'écriture d'un nombre réel dans des bases différentes.

    et

    Ashkan Nikeghbali (Zürich):L'heuristique matrices aléatoires en théorie des nombres.

    et un exposé complémentaire

    Joackim Bernier (Université de Rennes 1) : Markoff, et approximation diophantienne.

    Voir le site des JLA

  • Complex dynamics and quasi-conformal geometry
    Oct 23, 2017 to Oct 25, 2017

    Our colleague Tan Lei passed away in April 2016. A conference will be held from 23/10/2017 to 25/10/2017 at the University of Angers to honour her memory.

    Scientific Committee

    Etienne Ghys (ENS Lyon)
    John Milnor (Stony Brook)
    Mitsuhiro Shishikura (Kyoto).

    Organizing Committee

    Mohammed El Amrani (Angers)
    Michel Granger(Angers)
    Jean-Jacques Loeb(Angers)
    Laurent Meersseman(Angers)
    Pascale Roesch(Toulouse).

    Provisional list of speakers

    Xavier Buff, Arnaud Cheritat, Nuria Fagella (to be confirmed), Cui Guizhen,Peter Haissinski, John Hamal Hubbard (to be confirmed), Carsten lunde Petersen, Kevin Pilgrim, Mary Rees, Pascale Roesh, Hans Henrik Rugh, Dylan Thurston, Mitsu Shishikura, Giulio Tiozzo.

    More information : page

    The registration process is already open.

  • School - Masterclass 2017
    Dec 19, 2017 to Dec 21, 2017

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    Angers, from December 19th to December 21st

    Organization board: Etienne Mann

    We organize a masterclass in Angers, from 19th to 21st of December, 2017. Lectures will be in the morning sessions. We will have two parallel sessions:

    • Etienne Mann : Introduction to algebraic stacks
      We will introduce the notion of fibered category, Grothendieck topology and stacks. We will illustrate these notions on simple examples.
    • Loic Chaumont: Application of the matrix-tree-theorem

    The organisation board will pay the housing and the lunch. The other meals are not payed by the organizers. For the travel expenses, we will do our best in the limit of our budget.

    Date limite d'inscription 15 novembre.

  • Workshop - Numerical methods for algebraic curves
    Feb 19, 2018 to Feb 23, 2018

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    Rennes, from February 19th to February 23rd

    Organization board: Xavier Caruso, David Lubicz, Christophe Ritzenthaler, Marie-Françoise Roy

    Scientific board: Xavier Caruso, David Lubicz, Christophe Ritzenthaler, Marie-Françoise Roy

    This workshop will bring together researchers in complex and real algebraic geometry and applied mathematics (physics and cryptography) to discuss numerical methods and open problems on algebraic curves. There will be a number of introductory talks to each of the following topics and invited lectures from specialists: - Theoretical physics/DPE - Computations with the Jacobian - Random real topology - Complexity of computing topology of real algebraic curves - p-adic methods and applications to cryptography

  • Conference - Maths and Business Days
    Apr 12, 2018 to Apr 13, 2018

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    Vannes, from April 12th to April 13th

    Organization board: Christophe Berthon, Eric Darrigrand, Emmanuel Frénod, Fabrice Mahé, Loïc Chaumont

Thematic semester 2017 - Dynamics and Geometry

Geometry brings into play various spaces, such as Riemannian, Kähler or symplectic manifolds, graphs, and moduli spaces. By nature, it is intricately linked with many other mathematical fields, particularly Algebra, Topology and Group Theory. For more than a century, close interactions with dynamical systems have developed, as geometry has been providing examples such as billiards, geodesic flows, Hamiltonians, the Ricci flow, etc.

The study of such dynamical systems and their asymptotic properties has turned out to be a powerful tool in solving geometric problems, beautifully illustrated by the proof by Grigori Perlman of the Poincaré Conjecture using the Ricci flow on 3-dimensional manifolds.

The semestre "Dynamics and geometry", organized by the Centre Henri Lebesgue, will present recent progress around this interaction between dynamical systems and geometry, bringing together many international experts on the topic. It will also offer several conferences together with mini-courses, in order to make these topics accessible to a broad audience, including young researchers.

Program

Schools

Flows and Limits in Kähler Geometry (in partnership with Defimaths)

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

Analytical aspects of hyperbolic flows (in partnership with ERC)

Nantes, from July 3rd to July 7th

Organization board: Sebastien Gouëzel, Laurent Guillopé, Samuel Tapie

Scientific board: Nalini Anantharaman, Viviane Baladi, Colin Guillarmou, Masato Tsujii

Conferences

CAST - Contact and Symplectic Topology

Nantes, from January 26th to January 28th

Organization board: Baptiste Chantraine, Vincent Colin, Paolo Ghiggini

Scientific board: Jean-François Barraud, Baptiste Chantraine, Kai Cieliebak, Tobias Ekholm

Teichmüller Theory in Higher Dimension and Mirror Symmetry (in partnership with the CNRS)

Angers, from April 24th to April 28th

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

Infinite measure Dynamics

Brest, from June 6th to June 9th

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

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

Families of algebraic dynamical systems

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

Random walks on algebraic structures-On honour of Yves Guivarc'h

Rennes, from June 19th to June 23rd

Organization board: Bachir Bekka, Nizar Demni

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

Dynamics on representation varieties (in partnership with ERC, University of Luxembourg)

Rennes, from June 26th to June 30th

Organization board: Ian Biringer, Ludovic Marquis, Juan Souto

Scientific board: Uri Bader, Jeffrey F. Brock, Jean-Marc Schlenker

Young researcher meeting in dynamics and geometry (in partnership with GDR N° 3341 Platon)

Rennes, from September 6th to September 8th

Organization board: Françoise Dal'Bo, Frédéric Paulin, Barbara Schapira, Damien Thomine

Geometric Analysis at Roscoff

Roscoff, from October 9th to October 13th

Organization board: Paul Baird, Gilles Carron, Ali Fardoun, Carl Tipler

Scientific board: Gérard Besson (CNRS, Institut Fourier), Olivier Biquard (ENS Paris), Ahmad El Soufi (Univ. Tours)

Partners

Irmar LMJL ENS Rennes LMBA LAREMA

Affiliation

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