had a vast participation of mathematicians coming from many diﬀerent viewpoints
of singularity theory.
Therefore, we decided to publish these proceedings in two independent volumes,
according to a -sometimes artiﬁcial- judgment by the editors as to what are the
primary topics and techniques of each article. One volume focuses on algebraic and
analytic aspects of singularity theory; the other focuses on geometric and topological
viewpoints. Even though such a classiﬁcation may seem arbitrary in some cases,
this splitting of the proceedings of the “Lˆe-Fest” should help the reader to ﬁnd
more easily the articles that are most relevant to him/her at a given moment.
The Scientiﬁc Committee was composed of Jean-Paul Brasselet (Institut de
Math´ ematiques de Luminy-CNRS, Luminy, France), David Massey (Department
of Mathematics, Northeastern University, Boston, USA), Jos´ e Seade (Instituto
de Matem´ aticas Unidad Cuernavaca, UNAM, Cuernavaca, Mexico) and Bernard
Teissier (Institut Math´ ematique de Jussieu, CNRS-Paris 6-Paris 7, Paris, France).
There was also an Organizing Committee, composed of the local organizers
Hayd´ ee Aguilar, Fuensanta Aroca, Jos´ e Luis Cisneros-Molina, Elsa Puente and
Jawad Snoussi, (all from Instituto de Matem´ aticas, UNAM, Unidad Cuernavaca,
Mexico), and David Alexandre Ellwood (Clay Mathematics Institute, USA) and
Marcio Soares, (Universidade Federal de Minas Gerais, Brazil), who did a magnif-
icent job of organizing a very strong participation of mathematicians from Brazil,
mostly from the S˜ao Carlos school. All of the local organizers did tremendous
work, and the meeting was so full of good mathematics, friendship, and happiness,
that we are certain this will leave a mark in the heart of each participant, and
will be a most stimulating remembrance for the many young mathematicians who
participated in the meeting.