Third Meeting

Our third meeting will take place at IMJ-PRG from Thursday April 23 to Friday April 24, 2026. It will be held at IMJ-PRG in Jussieu. Talks will be given in English.

Tentative schedule:

There will also be a dinner on Wednesday 22 April.

Thursday 23 April:

• 09h00-09h30 (15-16 417): Welcome coffee and tea
• 09h30-10h30 (15-25 102): Anders Karlsson (Université de Genève)
• 10h30-11h00 (15-16 417): Coffee break
• 11h00-12h00 (15-25 102): Joaquín Lejtreger (IMJ-PRG)
• 12h00-14h00: Lunch at Ardoise, Jussieu
• 14h00-15h00 (15-25 102): “Carathéodory distance-preserving maps between bounded symmetric domains”, Bas Lemmens (Kent)
• 15h00-15h30 (15-16 417): Coffee break
• 15h30-17h00 (15-25 102): Discussion
• 19h00: Dinner

Friday 24 April:

• 09h30-10h30 (15-25 102): Xavier Allamigeon (Inria, Polytechnique)
• 10h30-11h00 (15-16 417): Coffee break
• 11h00-12h00 (15-25 102): Bruno Duchesne (Orsay)
• 12h00-14h00: Lunch at Ardoise, Jussieu
• 14h00-15h00 (15-25 102): Balthazar Fléchelles (Université Grenoble-Alpes)
• 15h00-16h00 (15-25 102): Discussion

List of attendees:

• Marianne Akian (Inria, Polytechnique)
• Xavier Allamigeon (Inria, Polytechnique) (speaker)
• Amanda Bigel (Inria, Polytechnique)
• Gilles Courtois (IMJ-PRG)
• Bruno Duchesne (Orsay) (speaker)
• Elisha Falbel (IMJ-PRG)
• Xenia Flamm* (MPI Leipzig)
• Balthazar Fléchelles (Université Grenoble-Alpes) (speaker)
• Luca Froger (Université de Montpellier)
• Grace Garden (IMJ-PRG)
• Stéphane Gaubert (Inria, Polytechnique)
• Antonin Guilloux (IMJ-PRG)
• Anders Karlsson (Université de Genève) (speaker)
• Ricardo Katz (CONICET)
• Joaquín Lejtreger (IMJ-PRG) (speaker)
• Bas Lemmens (Kent) (speaker)
• Anne Parreau (Université Grenoble-Alpes)
• Constantin Vernicos (Université de Montpellier)
• Cormac Walsh (Inria, Polytechnique)
• Pierre Will* (Université Grenoble-Alpes)

*To be confirmed

Abstracts:

• Anders Karlsson (Université de Genève) – TBA
• Joaquín Lejtreger (IMJ-PRG) – TBA
• Bas Lemmens (Kent), “Carathéodory distance-preserving maps between bounded symmetric domains”

An interesting problem in the theory of several complex variables is to find conditions under which every map between two given complex manifolds preserving the Caratheodory or Kobayashi distance is either holomorphic or anti-holomorphic. It is generally believed that as long as the domains are not biholomorphic to a Cartesian product of domains, the distance-preserving map is either holomorphic or anti-holomorphic. In this talk I will discuss some results regarding this problem in the setting of bounded symmetric domains, aka noncompact type Hermitian symmetric spaces. We see will how one can exploit Jordan triple theory and the large-scale geometry of the Carathéodory distance to obtain results without posing any smoothness assumptions on the maps.

The talk is based on joint work with Cormac Walsh (INRIA/Ecole Polytechnique, Paris).

• Xavier Allamigeon (Inria, Polytechnique) – TBA
• Bruno Duchesne (Orsay) – TBA
• Balthazar Fléchelles (Université Grenoble-Alpes) – TBA