Abstract
We build examples of properly convex projective manifold which have finite volume, are not compact, nor hyperbolic in every dimension . On the way, we build Zariski-dense discrete subgroups of $\SL_{n+1}(\R)$ which are not lattice, nor Schottky groups. Moreover, the open properly convex set is strictly-convex, even Gromov-hyperbolic. Nous construisons des exemples de variétés projectives proprement convexes de volume fini, non hyperbolique, non compacte en toute dimension . Ceci nous permet au passage de construire des groupes discrets Zariski-dense de $\SL_{n+1}(\R)$ qui ne sont ni des réseaux de $\SL_{n+1}(\R)$, ni des groupes de Schottky. De plus, l'ouvert proprement convexe est strictement convexe, même Gromov-hyperbolique.
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