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Ce volume rassemble, essentiellement, des notes de cours elaborees a l'occasion de l'ecole d'ete qui a eu lieu a l'Institut Fourier (Grenoble) durant l'ete 2004. Le nom de celle-ci: « Geometries a courbure negative ou nulle, groupes discrets et rigidites » a ete repris pour intituler le present livre. Bien souvent, ces notes de cours ont ete substantiellement remaniees apres coup.
This volume gathers essentially lecture notes taken at the Summer School which took place at the Institut Fourier (Grenoble) during the Summer of 2004. The title of the Summer School ("Negative or zerocurvature geometries, discrete groups and rigidities") has been used for the present volume. In many cases the lecture notes have been rewritten and enhanced.
