Coming talks: (scheduled on Fridays from 9:30 to 10:30 for the Petite École de Combinatoire and from 10:45 to 11:45 for the workgroup, in room 076 by default)


2014-2015

2014-2015, 178 le vendredi 19/6/2015 car colloque 3 jours 2015-2016, aucune salle du LaBRI pour le vendredi 25/9/2015 car conférence EuroMPI (21-25/9/15)


Vendredi 3 avril : journée Labyrinthe


Jeudi 9 avril de 14h à 15h (salle 076) : Tony Guttmann (Department of Mathematics and Statistics, The University of Melbourne, Australia) http://www.ms.unimelb.edu.au/~tonyg/

Titre : Integrability, Solvability and Enumeration

Résumé : There are a number of seminal two-dimensional lattice models that are integrable, but have only been partially solved, in the sense that only some properties are fully known (e.g. the two-dimensional Ising model, where the free-energy is known, but not the susceptibility). Alternatively, critical properties are known for some lattices but not others. For example, the critical point of the self-avoiding walk model is known rigorously for the honeycomb lattice, but not for other lattices. Similarly for the q-state Potts model and both bond and site percolation. The critical manifold of the former is known only for some lattices, likewise the percolation threshold is known only for some lattices.
A range of numerical procedures exist, based on exact enumeration, or other numerical work, such as calculating the eigenvalues of transfer matrices, which, when combined with various structural invariants seem to give exact results in those cases that are known to be exact, but can be used to give increasingly precise estimates in those cases which are not exactly known. Reasons for this partial success are not well understood. In this talk I will describe four such procedures, and demonstrate their performance, and speculate on their partial success.


Vendredi 10 avril : à saisir


Vendredi 17 avril : Mireille Bousquet-Mélou

Titre : Chemins de Gessel dans le quadrant

Résumé :


Vendredi 24 avril : à saisir


Vendredi 1er mai : férié


Vendredi 8 mai : férié


Historique du Groupe de Travail et de Petite École de Combinatoire


http://www.u-bordeaux1.fr/fileadmin/images-PDF/FORMATION/calendrier-enseignements-2013-14_.pdf Jours fériés (susceptibles de concerner un vendredi) : 1er novembre, 11 novembre, 25 décembre, 1er janvier, 1er mai, 8 mai, jeudi de l'Ascension (vers la mi-mai) Friday, jj(th) mmmm: ... Title: ... Abstract: ... plan tranches 1&2 http://www.pmwiki.org/wiki/PmWiki/Characters Envoyez un courriel au secrétaire (Olivier Guibert) du Groupe de Travail si vous avez un exposé à présenter. JCB 2015 journées ALÉA du ... au .../.../2015 relâche Message publicitaire (de Vincent) : le 23 mai à 10h45 en salle 2 de l'IMB (Institut de Mathématiques de Bordeaux), Glenn Merlet parlera d'Applications topicales aléatoires itérées au séminaire de Géométrie. (cf. sondage à http://framadate.org/gft8c4r8u9khhvnc)


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