Arrived on July 1^st, 2024, Denis Grebenkov left the CRM-CNRS (IRL3457) on December 31, 2024.

During his stay, he was able to initiate projects with

• L. Bundrock (University of Alabama, United States of America);
• A. Girouard (Laval University);
• D. Kinzebulatov (Laval University);
• M. Levitin (University of Reading, UK);
• I. Polterovich (University of Montreal).

He also took advantage of his stay to expand his scientific network to University of British Columbia and Simon Fraser University.

On Friday, November 22, 2024, the director of CRM-CNRS met with the director of the mathematics department at the University of Ottawa, Alistair Savage.

The main tools for mathematical cooperation between France and CRM partners, including the University of Ottawa, were detailed:

• the reception at CRM-CNRS of scientists working in France “assigned on delegation” thanks to joint funding from CNRS and the employer of the assigned person;
• the support program for the international laboratory of the Quebec Research Fund in four pillars:
  • receptions of mathematicians coming from France,
  • long-term research stays in France for CRM members,
  • participation in scientific events in France by CRM members,
  • research internships for students.

The website presenting all cooperation opportunities in mathematics between France and Canada was presented.

On Friday, November 22, 2024, the director of CRM-CNRS met with the director of the CNRS office in Canada, Jan Matas.

This meeting was an opportunity to discuss the positioning of CNRS in Canada, mathematics in Canada, the role of mathematics at CNRS, and the important role played by the National Institute of Mathematical Sciences and their Interactions in the French mathematical community.

On Friday, November 22, 2024, the director of CRM-CNRS met with Mr. Jean-François Doulet, the Scientific and University Cooperation Attaché at the French Embassy in Ottawa.

This meeting provided an opportunity to present the international laboratory CRM-CNRS; to discuss the scientific positioning of France in Canada, the challenges of mathematical cooperation in Canada; and then the role of mathematics at CNRS and the important role played by the National Institute of Mathematical Sciences and their Interactions in the French mathematical community.

The CRM-CNRS will hold its internal seminar on November 12, 2024, from 9 a.m. to 1 p.m. in room 4336 of the Aisenstadt Pavilion (Université de Montréal).

Four scientific talks will be given by:

• Denis Grebenkov
• Sophie Dabo-Niang
• Antoine Zurek
• Nicolas Bousquet.

Program

9:30 a.m.: Antoine Zurek

Some theoretical and numerical results for local and nonlocal diffusion systems

In this talk, I will provide a brief overview of my research on parabolic PDEs. First, I will present some results related to the numerical analysis of the local and nonlocal Shigesada-Kawasaki-Teramoto (SKT) cross-diffusion system. Next, I will introduce and explain the main ideas behind the Computer-Assisted Proofs (CAP) approach. These methods can be powerful tools to study some PDEs when more classical techniques do not yield results. As an example, I will briefly explain how these techniques allow us to obtain the first existence result for the so-called Diffusion Poisson Coupled Model (DPCM).

On Monday 11. November 2024, the director of CRM-CNRS met with Ms. Janice Bailey, the Vice-President for Research – Scientific Direction in the Nature and Technologies sector of the Fonds de recherche du Québec (FRQ).

The meeting was an opportunity to thank the FRQ for its significant efforts in promoting cooperation in mathematics between Quebec and France, particularly through a grant to the Centre de recherches mathématiques (CRM) for this purpose.

On Wednesday, November 6, 2024, the director of CRM-CNRS met with the Vice-Rector for Research, Discovery, Creation, and Innovation of the University of Montreal, Marie-Josée Hébert.

The meeting was an opportunity to thank the University of Montreal for hosting CRM-CNRS in its facilities and to express the importance of the investment from CNRS and the Fonds de recherche du Québec for Franco-Quebec cooperation in mathematics.

The main tools of this cooperation were presented:

Starting November 1, 2024, and for seven months, the CRM-CNRS welcomes Pierre Baumann

Pierre BAUMANN

Researcher, CNRS

11/01/2024 – 06/30/2025

Pierre Baumann is a CNRS researcher at the Institute for Advanced Mathematical Research in Strasbourg. His work focuses on representations of Lie groups and algebras, at the intersection of algebra, combinatorics, and geometry. In his mathematical garden one can find various species of preprojective algebras, affine Grassmannian varieties, affine root systems, crystal polytopes and paths, cluster structures, and the ever-challenging perverse sheaves. His stay at the CRM will allow him to pursue long-standing collaborations with colleagues at LACIM (UQAM).

On October 28, 2024, the inaugural conference of the Franco-Uruguayan Institute of Mathematics and Interactions (Ifumi) was held in Montevideo (Uruguay). Established fifteen years ago, the laboratory has acquired the status of an international research laboratory of the CNRS (IRL).

Welcome to this sixth international research laboratory of the CNRS (IRL) in mathematics on the American continent!

• Presentation article of Ifumi on the Insmi website

The CRM-CNRS is holding the general assembly of its scientific staff on October 4, 2024, at 10 a.m. in room 5374-1.

Starting September 1, 2024, the CRM-CNRS IRL will host nine scientists for long-term stays.

Nicolas BOUSQUET

Researcher, CNRS

09/01/2024 – 08/31/2025

After earning a PhD in fundamental computer science in 2013 at LIRMM in Montpellier, Nicolas Bousquet joined CNRS in 2016 as a researcher, first at the G-SCOP laboratory in Grenoble and since 2020 at the LIRIS laboratory in Lyon.

The core of his research focuses on structural theory and graph algorithms. But his interests extend beyond these topics: game theory, combinatorics… In recent years, he has focused on reconfiguration problems, which aim to determine conditions that guarantee the existence of transformations between problem solutions. He also works on distributed algorithms and local certification.

Dear colleagues at the CRM, dear colleagues at the IRL,

My term as director of the IRL (or UMI) comes to an end after an additional year, and Emmanuel Royer will take over on September 1. Emmanuel is a professor at Université Clermont-Auvergne, where he headed the Blaise Pascal Mathematics Laboratory from 2014 to 2018 before serving as deputy scientific director of the CNRS National Institute for Mathematical Sciences and their Interactions (INSMI) from 2018 to 2023. Since his PhD, prepared under Étienne Fouvry and Philippe Michel and defended in 2001, he has worked in number theory, focusing in particular on modular forms and related functions.