On Tusday, April 8, 2025, the director of CRM-CNRS met with the future Vice-Rector for Research and Innovation of the University of Montreal, Vincent Poitout.

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:

• the hosting 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 Fonds de recherche du Québec in four pillars:
  • hosting 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 introduced.

On Wednesday, March 19, 2025, the director of CRM-CNRS met with the new director of the CNRS office in Canada, Andréa Dessen.

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

Arrived on September 1^st, 2024, Antoine Zurek left the CRM-CNRS (IRL3457) on February 28, 2025.

He was able to participate in the thematic program Computational Dynamics: Analysis, Topology, and Data organized by the Centre de recherches mathématiques from September 5 to November 15, 2024.

This participation and subsequent integration into the community of computer-assisted proof methods allowed him to begin collaborations, notably with Matthieu Cadiot, then a doctoral student at McGill University, as well as with mathematicians working in France with whom he will be able to continue his work in this field.

Arriving on September 1^st, 2024, Sophie Dabo-Niang left the CRM-CNRS (IRL3457) on February 28, 2025.

She was able to initiate collaborations with:

• Bouchra Nasri, associate professor at Université de Montréal;
• Claire Guerrier, research officer at CNRS, member of CRM-CNRS.

She worked with Mamadou Yauck, assistant professor at Université du Québec à Montréal on issues of mathematics dissemination within the scientific communities of Quebec, France, and Africa.

Finally, she co-organized the summer school on quantitative molecular and cellular biology in collaboration, which took place from June 16 to 27, 2025, at Université du Manitoba.

The CRM-CNRS is holding its internal seminar on Tuesday, February 18, 2025, in room 4336 (André Aisenstadt Pavilion, University of Montreal), from 9:30 AM to 1:00 PM.

Four scientific presentations will be given by:

• Sébastien Darse;
• Emmanuel Royer;
• Ewen Gallic;
• Thierry Daudé.

Program

9:30 AM: Sébastien Darses

Some themes around the zeta function.

We will talk a bit about analytic continuation and approximation problems. The presentation will be very accessible and does not require any particular knowledge beyond a bachelor’s degree.

On February 12 and 19, 2025, Emmanuel Royer gave two one-hour presentations to the fourth and high school students of Collège Stanislas in Montreal (a French school abroad under AEFE). The purpose of the presentation was to make sense of counting prime numbers after demonstrating that there are infinitely many, and then to explore the distribution of prime numbers.

Professor at Université Clermont-Auvergne, Emmanuel Royer is hosted on a delegation for institutional functions by CNRS, to lead the CRM-CNRS.

On January 24, 2025, Emmanuel Royer gave a two-hour talk to Terminale students enrolled in the advanced mathematics specialization at Collège Stanislas in Montréal (a French school abroad of the AEFE network). The aim of the talk was to show how a topic in the arithmetic curriculum—Fermat’s little theorem—although dating back to 1640, underwent 20th-century extensions that underpin today’s secure Internet communications.

A full professor at the Université Clermont-Auvergne, Emmanuel Royer is on CNRS institutional delegation to direct the CRM-CNRS.

On January 23, 2025, a group of mathematicians from the CRM-CNRS (Michèle Couderette, Sébastien Darses, and Emmanuel Royer) visited Collège Stanislas in Montréal (a French school abroad of the AEFE network) to discuss the French and Québec mathematics curricula with the school’s mathematics program coordinator, Antoine le Gouëfflec.

Hosted on long-term CNRS delegation at the CRM-CNRS, Michèle Couderette is an associate professor at the Université Paris-Est Créteil.

Hosted on long-term CNRS delegation at the CRM-CNRS, Sébastien Darses is an associate professor at Aix-Marseille Université.

On January 22, the students of Collège Stanislas in Montréal (a French school abroad of the AEFE network) attended an hour of “hands-in-pockets mathematics.” Ten-minute flash talks were given by CRM-CNRS scientists to troisième students (two one-hour sessions) and to students in Seconde, Première and Terminale (French lycée levels) (one one-hour session). The aim was to present a mathematical topic in a relaxed way with minimal written support, in particular to give students ideas for oral exam topics for the Diplôme national du brevet and the Baccalauréat.

On Wednesday, January 15, 2025, the director of CRM-CNRS met with Mr. Nicolas Douay, the Scientific and University Cooperation Attaché at the French Consulate General in Quebec (Montreal).

This meeting provided an opportunity to present the international laboratory CRM-CNRS; to discuss the scientific positioning of France in Quebec, the challenges of mathematical cooperation in Quebec; and 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.

Starting January 1, 2025, and for one year, the CRM-CNRS welcomes Nicolas Crampé.

Nicolas CRAMPÉ

Researcher, CNRS

01/01/2025 – 12/31/2025

After graduate studies at the École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Nicolas Crampé completed a PhD at the Laboratoire d’Annecy de Physique Théorique (LAPTh) at Université de Savoie. Recruited by CNRS in 2009, he has worked at Université de Montpellier and, since 2018, at Université de Tours. A specialist in exactly solvable systems and representation theory, Nicolas Crampé uses algebraic tools to explore the symmetries underlying various physical problems. His research focuses on calculating entanglement entropies in quantum mechanics, evaluating mean values in non-equilibrium statistical models, and spectral analysis of Hamiltonians. More recently, he has also become interested in certain special functions and their role in the study of algebra representations, association schemes, and quantum integrable models.