GT et PÉC de l'équipe Combinatoire et Interactions

The Combinatoire et Interactions seminar runs every Monday from 10h45 to 11h45. There is also a reserved schedule for a "mini-school" from 9h30 to 10h30. Both events happen in room 076 on the ground floor of LaBRI (building A30).
When a talk is recored it is available (live and recorded) at
https://u-bordeaux-fr.zoom.us/j/83326403471?pwd=VLapX1qCOgASs3V8OktWtKEr8dn041.1
Meeting ID: 833 2640 3471
Passcode: 1251442
Contact the secretaries (Vincent Delecroix, Oscar Fontaine and Juliette Schabanel) if you want to propose a talk or to receive announcements.
For the list of previous talks, look at the menu "GT CI" on the right side of this page.


2025-2026


Lundi 19 janvier: Thomas Lejeune (IMJ, Paris)

Title: Enumeration of plane hypermaps with a mixed boundary.

Abstract: Hypermaps, meaning maps in which each face carries a cyclic orientation, constitute a rich and growing area of modern combinatorics, with notable applications to quantum gravity and random surface models. In this talk, we focus on plane hypermaps with mixed boundary, meaning that the outer face may have an arbitrary orientation. We introduce two combinatorial tools designed to analyze these objects: slices and accessible components. The central idea is to decompose a hypermap according to whether each vertex can reach a distinguished vertex, which yields elegant explicit formulas for the generating functions of hypermaps with boundary hence recovering, and in some cases refining, known results.

Work carried out in collaboration with J. Bouttier and B. Eynard.

Lundi 26 janvier: sage days 130 au Teich

Lundi 2 février: JCB

Lundi 9 février: Nicolas Tokka (IRIF, Paris)

Mardi 10 février: Soutenance de thèse de Pierre Bonnet à 10h

Lundi 16 février: vacances universitaires

Lundi 23 février: Mireille Bousquet-Mélou

Lundi 2 mars: June Roupin (LIGM, Marne-la-Vallée)

Lundi 9 mars: à saisir

Lundi 16 mars: à saisir

Lundi 23 mars: à saisir

Lundi 30 mars: à saisir

Lundi 6 avril: Lundi de Pâques

Lundi 13 avril: vacances scolaires

Lundi 20 avril: Nicolas Bedarride

Lundi 27 avril: Joseph Ben Geloun (LIPN, Villetaneuse)


Français English

Group

Events

Talks

* previous years

Resources

edit SideBar