# 5 minutes Lebesgue

## À quoi servent les mathématiques ?

Quelques chercheurs rennais tentent de répondre à cette question.

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- 5 minutes LebesgueMar 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 AntoineMar 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 GeometryApr 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 SingerKähler 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 SymmetryApr 24, 2017 to Apr 28, 2017
Angers, from April 24th to April 28th

*Organization board*: Frédéric Mangolte, Etienne Mann, Laurent Meersseman, Alexis RoquefeuilTeichmüller 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 QuimpériodiqueJun 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

### Affiche

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- Conference - Infinite measure DynamicsJun 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 SzaszThis 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 systemsJun 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'hJun 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 LubotzkyThe 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.

Quelques chercheurs rennais tentent de répondre à cette question.

IRMAR

21 August 2016

grand public

Mathematical field:

algebra, analysis, combinatorics, didactic, geometry, probability, scientific computing, statistics

Keywords:

utilité des mathématiques

Attachment | Size |
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5min-utilite01.mp4 | 26.3 MB |