possible. We are also grateful to the rest of our sponsors: the International As-
sociation of Mathematical Physics, Centre de Physique Th´eorique Marseille, Uni-
versit´ e de Cergy-Pontoise, Universit´ e de la Mediterran´ ee, F´ed´ eration de Recherche
des Unit´ es de Math´ ematiques de Marseille, CNRS D´epartement MPPU, GDRE
Mathematics and Quantum Physics, Ville de Marseille, R´egion Provence-Alpes-
Cˆ ote d’Azur, Conseil G´ en´ eral des Bouches du Rhone.
We would like to thank our mini-course lecturers Bernard Helﬀer and Hajo
Leschke for the excellent job they did, our invited speakers, the students who gave
mini-talks, and all the people who came to this meeting, for their active participa-
Finally, we would like to thank the authors who contributed to this volume,
the referees for their professional work, Lilia Simeonova for handling manuscripts
and referee reports, the editorial board of the AMS for giving us the possibility to
publish these proceedings, and especially Christine Thivierge for her assistance.