• HJ2016: Hamilton-Jacobi Equations: new trends and applications
    May 30, 2016 to Jun 3, 2016

    The objective of the HJ2016 conference is to gather researchers working in the theory of Hamilton-Jacobi equations and related topics. This conference is organized by the ANR project HJnet "Hamilton-Jacobi equations on heterogeneous structures and networks". The topics discussed include:

    Nonlinear Partial Differential Equations Theory of viscosity solutions for Hamilton-Jacobi equations Optimal control and Hamilton-Jacobi equations on networks Mean Field Games Homogenization and singular perturbation problems Applications to traffic

    The registration will open on Friday, March 11th 2016 and close on Monday, April 25th. Registration is mandatory for all participants.

    Invited speakers

    Martino Bardi (Universita degli studi di Padova)
    Guy Barles (Université François-Rabelais de Tours)
    Pierre Cardaliaguet (Université Paris-Dauphine)
    Adina Ciomaga (Paris)
    Christian Claudel (The University of Texas at Austin)
    Rinaldo Colombo (Universita degli studi di Brescia)
    Andrea Davini (Universita "La Sapienza" di Roma)
    Maurizio Falcone (Universita "La Sapienza" di Roma)
    Jérémy Firozaly (École Nationale des Ponts et Chaussées)
    Giulio Galise (Universita degli studi di Salerno)
    Yoshikazu Giga (The University of Tokyo)
    Nao Hamamuki (Hokkaido University)
    Cristopher Hermosilla (Louisiana State University)
    Hitoshi Ishii (Waseda University)
    Shigeaki Koike (Tohoku University)
    Espen Jakobsen(Trondheim)
    Pierre-Louis Lions (Collège de France)
    Claudio Marchi (Universita degli studi di Padova)
    Sepideh Mirrahimi (Université Paul Sabatier de Toulouse)
    Vinh Duc Nguyen (Cardiff University)
    Alessio Porretta (Universita di Roma Tor Vergata)
    Panagiotis Souganidis (The University of Chicago)
    Erwin Topp Paredes (Universidad de Santiago de Chile)
    Maxime Zavidovique (Université Pierre et Marie Curie)

  • 5 minutes Lebesgue
    May 31, 2016

    The movies will be available online a few days after the talks.

    Forthcoming talks

    19-04-2016:  Axel Rogue

    26-04-2016:  Ghislaine Gueudet

    10-05-2016:  Rozenn Texier-Picard

    24-05-2016:  Vincent Mineo Kleiner

    14-06-2016:  Barbara Schapira

    21-06-2016:  Christophe Ritzenthaler

  • Workshop - Statistical methods for dynamical stochastic models - DYNSTOCH 2016
    Jun 8, 2016 to Jun 10, 2016

    Rennes, from June 8th to June 10th

    Organization board: Michael Sorensen, Dominique Dehay, Ronan Le Guével

    Scientific board: Reinhard Höpfner, Adeline Leclercq Samson, Michael Sorensen, Masayuki Uchida, Dominique Dehay

    The DYNSTOCH network is an international network of researchers on various topics in the inference for stochastic processes. The aim is to bring major contributions to this thema using the tools of modern probability theory including stochastic calculous as well as intensive scientific computing methods.

    The focus is on estimation, testing and prediction methods for complex dynamic models such as e.g. diffusions, branching processes ... The problems of interest are for example in modeling and data analysis in finance, turbulence, neuroscience, telecommunication networks, hydrology, and other complex technological systems.

    The DYNSTOCH 2016 workshop will be held from Wednesday, June 8th to Friday, June 10th at University Rennes 2 (Campus Villejean, Rennes, France)

    The deadline for submission of contributions is May 8th, and the deadline for registration is May 8th.

  • School - Mathematical Methods of Statistics
    Jun 20, 2016 to Jun 25, 2016

    Angers, from June 20th to June 25th

    Organization board: Piotr Graczyk, Frédéric Proïa


    1. MAIN LECTURES (3-5 hours each) by invited professors (see Program)
    2. "LIGHTNING" TALKS (5 minutes) by participants
    3. POSTER SESSION by participants

    PARTICIPATION FEE (including Board and lodging) 75E.

    DEADLINE FOR REGISTRATION: Monday June 6, 2016

  • Conference - 31st International Workshop on Statistical Modelling
    Jul 4, 2016 to Jul 8, 2016

    Rennes, from July 4th to July 8th

    Organization board: Pierrette Chagneau, Jean-François Dupuy, Martine Fixot, Julie Josse, Nathalie Krell, James Ledoux, Laurent Rouvière, Myriam Vimond

    Welcome to the webpage of the 31st International Workshop on Statistical Modelling (IWSM).

    The 31st edition of the IWSM will be held in Rennes (France) from 4 to 8 July 2016, hosted by the Institut National des Sciences Appliquées.

    IWSM is one of the major activities of the Statistical Modelling Society, founded with the purpose of promoting and encouraging statistical modelling in its widest sense, involving both academic and professional statisticians and data analysts. Since its first edition, the spirit of the workshop has always been to focus on problems motivated by real life data and on solutions that make novel contributions to the subject.

    The atmosphere of the workshop is friendly and supportive, with no parallel sessions, with the aim of stimulating the exchange of ideas and experiences related to statistical modelling. As a sign of positive feedback the IWSMs report many returning participants.

    Papers focusing on applications with important substantive implications as well as methodological issues are welcome. Submissions by students and young researchers are particularly encouraged.

    New information about the 31st IWSM will be continuously added on this website. If you have any questions or comments, please contact us.

  • Conference - Lebesgue PhD meeting 2016
    Oct 19, 2016 to Oct 21, 2016


    Angers, from October 19th to October 21st

    Organization board: Clément du Crest de Villeneuve, Clément Fromenteau, Guillaume Roux, Johan Leray

    Scientific board: Viet Anh Nguyen, Olivier Thom, Caroline Vernier

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


    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 17, 2017 to Apr 21, 2017


    Nantes, from April 17th to April 21st

    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.



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