%I Elsevier Masson
%R doi:10.1016/j.crma.2007.07.020
%P 341-344
%L eprints984
%A Irene Crimaldi
%A Giorgio Letta
%A Luca Pratelli
%V 345
%D 2007
%N 6
%T Sur l'interversion de l'ordre entre deux op?rations sur les tribus
%J Comptes rendus math?matique
%X We characterize the measurable spaces (?,A) such that, for each sub-?-field G of A and each decreasing filtered family (F_t) of sub-?-fields of A, with F_t ? F_?, we have F_t ? G ? F_? ? G. It follows a characterization of the probability spaces (?, A, P) such that, for each sub-?-field G of A and each decreasing sequence (F_n) of sub-?-fields of A, with F_n ? F_?, we have ?_n (F_n ? G) ? F_? ? G (mod P).