ASPI : Analyse spectrale et problèmes inverses Groupe de travail CPT-I2M
              (anciennement nommé GOMS)
This working group (formerly called GOMS, for Guides d’Ondes et Milieux Stratifiés) was created at the initiative of P. Duclos and Y. Dermenjian in 2003. Until the end of 2019 Michel Cristofol and Eric Soccorsi have been responsible for this working group. They are replaced in 2020 by


The MEB (Mathematics, Evolution, Biology) seminar is organized by the
BioMath-Alea/SEM sub-team (from the former SEM team in 2017).
It is also the continuation of the MEG seminar of the former MMG (IML) and EM (LATP) teams
before the creation of the I2M.  As the team brings together mathematicians and biologists, the SEM seminar is interested in both modelling biological phenomena and processing their data.
The main theme of the seminar is biological evolution, and more broadly population biology
(population genetics and genomics, ecology, epidemiology, etc.).
But any presentation that falls within a team axis, or more generally interactions between
mathematics and biology are welcome.

Organiszer: Mikaël Kopp

Deterministic and Probabilistic Dynamical Systems

This scientific project is in the domain of the probabilistic and statistical properties of dynamical
systems. We can identify two main axes of theoretical investigation which very often share questions,
methods and objectives.
•The first concerns deterministic dynamical systems
. In recent years efforts of mathematicians have been directed to study and understand systems beyond uniform hyperbolicity; notions of non-uniformly hyperbolic attractors, partially hyperbolic attractors, non-uniformly
expanding maps and flows have been introduced. These recent developments concern dynamical systems preserving a probability measure as well as dynamical systems preserving an infinite measure.
•The second deals with perturbations of deterministic system, which induces an additional source of randomness and allows us to define new models such as sequential dynamical systems, non-stationary, quenched and fibred dynamical systems, etc. In this context the proofs of limit theorems show new difficulties and call for new approaches and techniques or adaptations of previous methods.
Oganizer : Sandro Vaienti


This working group is designed as the first meeting of a small group of topologists
and symplecticians, with the aim of initiating collaborations on issues related to
the trisections theory of smooth varieties of size 4. Two main axes are envisaged:
the links between trisections and symplectic structures on the one hand, the generalization of trisections in on the other hand. For this meeting, it is planned to invite David Gay, initiator
with Robion Kirby of the trisections theory, to give lectures, taking advantage of his presence in Europe this year.

The working group will last one week.Each participant will give a presentation on a topic corresponding to their specialty in the working group theme. These presentations will provide an update on the context of the issues raised. Group working time is also planned to decide on the avenues to follow in collaborative research work.

Organizer : Delphine Moussard (I2M)