Infinite dimensional non-positively curved symmetric spaces of finite   rank
  This paper concerns a study of three families of non-compact type symmetric spaces of infinite dimension. Although they have infinite dimension they have finite rank. More precisely, we show they have finite telescopic dimension. We also show the existence of Furstenberg maps for some group actions on these spaces. Such maps appear as a first step toward superrigidity results. 
Bruno Duchesne
math.DG math.GR math.MG