Espérance mathématique d’une variable aléatoire à valeurs dans un espace métrique à courbure négative. (Mathematical expectation of a random variable with values in a metric space of negative curvature).(French)Zbl 0638.60005

Summary: We define the class of metric spaces of negative curvature. If f is a random variable with values in a Polish space (X,d) of negative curvature, we define mathematical expectation of f as a closed, bounded non empty subset of X.

MSC:

 60B05 Probability measures on topological spaces