Séminaires : Séminaire d'Algèbre

Equipe(s) : gr,
Responsables :J. Alev, D. Hernandez, B. Keller, Th. Levasseur, et S. Morier-Genoud.
Email des responsables : Jacques Alev <jacques.alev@univ-reims.fr>, David Hernandez <david.hernandez@imj-prg.fr>, Bernhard Keller <bernhard.keller@imj-prg.fr>, Thierry Levasseur <Thierry.Levasseur@univ-brest.fr>, Sophie Morier-Genoud <sophie.morier-genoud@imj-prg.fr>
Salle : à distance
Adresse :IHP


Orateur(s) Anthony JOSEPH - ,
Titre Canonical S-graphs, Catalan numbers and convexity
Horaire14:00 à 15:00
RésumeThe notion of an $S$-graph is introduced. These are not unique but for each positive integer there is a canonical family. Each member of the family is given by the natural ordering on n distinct positive integers. The total number of distinct canonical $S$-graphs is not n! but the Catalan number $C(n)$. Each member of the family gives a set of $2^n$ points in $Q^n$ which turn out to be the extremal points of a convex set.
Salleà distance