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  • Post-doc positions
    Nov 1, 2016 to Jan 31, 2017
    lebesgue_money.png Henri Lebesgue Center offers post-doc positions for researchers in mathematics.

    Description

    The Lebesgue Center invites to apply for post-doctoral positions in mathematics for a period of six months to a year (renewable once). The hired applicant will conduct his/her research at one of these Insitutes:

    Irmar of Rennes
    LMJL of Nantes
    LMBA of Brest and Vannes
    LAREMA of Angers

    The position is open to all research areas present within the four Institutes. It does not include an obligation to teach.

    The net salary will be 2 100 Euros per month.

    Deadlines

    The application is open.

    Sending application: between the 1st of November 2016 and the 31st of January 2017.

    The 12-month positions are expected to begin on September 1st or October 1st, 2017.

    Eligibility

    Candidates must have completed a PhD in mathematics, or equivalent, at the date of taking office. The candidate must submit an original research project including a collaboration with one or more local researcher (s) of Irmar, LMJL,LMBA, or LAREMA.

    Applicants must complete the online form where they have to join the following documents:

    • CV describing the candidate's profile and professional experience (list of publications, research topics, activities)
    • Cover letter including the research project
    • At least two letters of recommendation, including one from the local researcher involved in the project
    (these letters can be uploaded by the applicant or directly sent by the recommending persons at the email address indicated in the second page of the online form)

    Selection

    The selection is carried by the Lebesgue Scientific Committee.

    Nominees

    2016-2017
    2015-2016
    2014-2015
    2013-2014

  • Lebesgue Master Scholarship
    Nov 15, 2016 to Mar 15, 2017
    lebesgue_money.png The Lebesgue Center offers 10,000€ scholarships to outstanding mathematics students applying for a master programme in mathematics, for a fist year of Master (M1) or for a second year of Master (M2), in Rennes, Nantes, Angers, Brest or Vannes.

    Eligibility

    The stipend is 10,000 euros per year.

    The M1 scholarships are open to all students who have completed a bachelor's degree in mathematics (or related) at the end of the academic year 2016-2017. The applicants for the Lebesgue M1 scholarship should certify a B1 level of proficiency of the French language.
    A student applying for the first year of a master (M1) will be allowed to apply for another scholarship for the second year (M2).

    The M2 scholarships are open to all students who have completed the first year of a master in mathematics (or related) at the end of the academic year 2016-2017.
    The courses of the second year of Master (M2) may be taught in English.

    The application of the Lebesgue scholarship is independent from the application to Masters programmes, whom modalities are indicated in the dedicated websites.

    Deadlines

    The application for the lebesgue Master Scholarship is open until March 15th, 2017.
    The results of the selection process will be edited in April 2017.

    Contact

    Applicants can obtain more information about the masters programmes on the page: Information.

    Application

    Applicants must complete the online form and attach the documents:
    - CV
    - Transcripts
    - Cover letter
    - One or more letters of recommendation.

    Applicants must submit the application only when it is complete. Only electronic submission using the online form will be considered.

    Selection

    The selection will be carried out by the Lebesgue Scientific Committee and the heads of the Masters programmes. It will be based on the academic quality of the applicant.

  • 5 minutes Lebesgue
    Dec 6, 2016

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

    Prochain exposé:

    06-12-2016:  Guillem CAZASSUS
    Partage d’un collier et sandwich de dimension 4

    Nous expliquerons comment un résultat de topologie peut permettre de résoudre un problème de nature combinatoire.

    Lieu

    Rennes

    Exposés à venir:

    13-12-2016:  Pierre Joray
    07-02-2017:  Bachir Bekka

  • Rencontre CHL-INRA
    Dec 8, 2016

    L'objectif de cette journée est de réunir des membres de l'INRA et du Centre Henri Lebesgue intéressés par collaborer et de mettre en relation les compétences mathématiques développées au CHL avec des applications potentielles émergeant des différentes thématiques de recherche développées à l'INRA. Cette journée sera organisée autour d'exposés ayant pour but de présenter les travaux menés en collaboration ou des sujets d'étude qui pourraient conduire à des collaborations. Ils seront suivis d'un temps de discussion afin de favoriser les échanges scientifiques autour du thème abordé.

    Organisation de la Journée

    10 h 00 Accueil des participants et café
    10 h 15 Christophe Berthon (CHL) : Présentation du Centre Henri Lebesgue et de l'agence Lebesgue
    10 h 25 (INRA) : Présentation du centre de Rennes de l'INRA
    10 h 35 Isabelle Louveau (INRA) : Plasticité des cellules souches adultes dans le muscle squelettique et le tissu adipeux du porc en croissance
    11 h 2 5 Sébastien Lê et Mathieu Emily (CHL) : Statistique en agronomie et agro-alimentaire
    12 h 15 Repas
    14 h 00 Florence Garcia-Launay (INRA) : Optimiser les stratégies d’alimentation des élevages d’engraissement porcins sur des critères économiques et environnementaux : premières démarches et perspectives
    14 h 50 Nicolas Parisey (INRA) : Scaling-up pest foraging behaviours to the agricultural landscape : a mechanistic model applied to crop protection
    15 h 40 Pause café
    16 h 00 Frédéric Hamelin (INRA) et François Castella (CHL) : Modelling the spread of organisms mixing sexual and asexual reproduction
    16 h 50 Conclusion de la journée
    17 h 00 Fin de la journée

    L'inscription est gratuite, mais obligatoire (avant le 24 novembre) pour participer au déjeuner. Les frais de déplacement pourront être pris en charge.

    Abstracts des interventions

    Les abstracts des interventions prévues sont ici

  • School - Masterclass
    Dec 13, 2016 to Dec 15, 2016

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    Angers, from December 13th to December 15th

    Organization board: Etienne Mann, Loïc Chaumont

    We organize a Masterclass in Angers from the 13rd to 15th December. Lectures will be in the morning sessions and exercises session will take place in the afternoon. We will have two parallel sessions:

    • Laurent Evain : The Hilbert scheme.
      The programm is grassmannian varieties, Hilbert scheme and some applications.
    • Rodolphe Garbit: Counting paths in an orthant: a probabilistic approach
      The lectures will focus on Brownian motion, random walks and their application to some combinatorial problems.

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

  • Journée Rennes Nantes d'analyse
    Jan 19, 2017

    La prochaine journée Rennes-Nantes d'Analyse aura lieu le jeudi 19 janvier 2017 à Nantes.

    Programme

    10h15-10h55 : Georgi Popov (Nantes)
    11h15-11h55 : Mounir Haddou (Rennes)
    12h00-12h40 : Thibaut Deheuvels (Rennes)

    14h30-15h10 : Olivier Pierre (Nantes)
    15h15-15h55 : Adrien Calvez (Rennes)

    Lieu

    Nantes

    Inscription

    Si vous souhaitez y participer, merci de vous inscrire avant le 5 janvier.
    Le formulaire d'inscription et les informations sont disponibles sur la page

  • Conference - CAST - Contact and Symplectic Topology
    Jan 26, 2017 to Jan 28, 2017

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    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

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

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    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 - Loop spaces in geometry and topology

Nantes, from Sept 1st to 5th, 2014
Contact: H. Abbaspour
Organisation board: H. Abbaspour (Nantes), A. Oancea (Paris), N. Wahl (Copenhagen)

One-dimensional objects have played a central role in geometry for a long time. From lines in Euclidean spaces to geodesics in Riemannian manifolds, particular classes of real one-dimensional sub-objects of a given space, i.e. loops or paths, have been successfully used as probes for the ambient geometry. At the local level, Riemannian curvature can be classically recovered from the behavior of geodesic paths via the Jacobi equation. At the global level, landmark results such as Morse's development of the calculus of variations in the large (1929), Berger's classification of holonomy groups (1953), Gromoll and Meyer's homological criterion for the existence of infinitely many closed geodesics (1969), or its reinterpretation by Sullivan-Vigué from the viewpoint of rational homotopy theory (1976), have shown deep connections between spaces of loops and analysis, Lie group theory, or topology. From a quite different perspective, string theory considers loops and paths (strings), as well as Riemann surfaces (worldsheets), as the basic building blocks for a unified theory of matter.

On the mathematical side, symplectic geometry appears to be the most natural setup within which real 1-dimensional objects (loops/paths) interact with complex 1-dimensional objects (Riemann surfaces). Gromov's theory of pseudo-holomorphic curves (1985) and its reinterpretation by Floer as a variational theory for the unregularized gradient flow of the symplectic action functional (1987) proved to be a successful tool in order to address the Arnold and Weinstein conjectures (1986, 1979) on the existence of closed orbits/chords for Hamiltonian systems. The geometric structure of compactified moduli space of pseudo-holomorphic curves gives rise to sophisticated algebraic structures, and in particular to various homology theories such as Floer homology, (embedded) contact homology, Seiberg-Witten-Floer homology, ... In all of these theories, one introduces higher products that account for all the non-canonical choices that one needs to make in order to lift an associative product from homology to the chain level. These operations get organized into a differential which is a coderivation on a larger object known to algebraic topologists as the “Bar construction”.

Almost simultaneously and inspired by the algebraic structures encountered in quantum field theory, algebraic topologists have been trying to understand the chain complexes of free loop and path spaces of a manifold. Chas and Sullivan's natural idea of cutting and pasting loops/paths together with considering Poincaré duality for the underlying manifold has led to a plethora of operations and opened a new field known as “string topology”. In parallel to this topological approach, a lot of effort was put into understanding the algebraic structure of “algebraic loop spaces”, modeled as Hochschild complexes of DGAs or categories equipped with further structures that account for Poincaré duality in the topological setting.

The various procedures for assigning a linear object (complex, homology, category...) to a nonlinear object gave rise to rich homotopical structures. There are many striking (algebraic) similarities between the constructions and difficulties encountered in each of the previous three settings. The common desire to reorganize non-canonical choices into higher homotopies and categories has also led to more elegant formulations of geometric and topological statements in terms of derived categories and functors.

We think that the time is ripe to bring together experts and young mathematicians working in these areas. We expect fruitful interactions and hope to harvest inspiration and new ideas. To this end, we intend to have 5 mini-courses accessible to non-experts, followed by a few talks dealing with more recent developments.

Partners

Irmar LMJL ENS Rennes LMBA LAREMA

Affiliation

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