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Poincaré series of finite geometric groups. (Séries de Poincaré des groupes géométriquement finis.) (French) Zbl 0968.53023
A Poincaré series can be associated with a discrete group of isometries (in particular with a finite geometric group $$\Gamma$$ considered in this paper) which acts on a Hadamard manifold (i.e., a negative pinched Riemannian manifold). The case when the group contains parabolic elements is studied in the paper under review. A sufficient condition on the parabolic subgroup of $$\Gamma$$, in order that $$\Gamma$$ be of divergent type, is given. If $$\Gamma$$ is of divergent type, a necessary and sufficient condition for the Sullivan measure on the unit tangent bundle of the orbit space to be finite is also given; this condition expresses the convergence of certain series, which involves only parabolic elements of $$\Gamma$$. Some suggestive examples are also given.

##### MSC:
 53C20 Global Riemannian geometry, including pinching 37A99 Ergodic theory 58D19 Group actions and symmetry properties
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