An Open Mapping Theorem for rings which have a zero sequence of units
  This paper provides an Open Mapping Theorem for topological modules over rings that have a zero sequence consisting of units. As an application it is shown that there is a unique complete and metrisable topology on finitely generated modules over certain topological rings (e.g. over complete noetherian Hausdorff Tate rings). 
T. Henkel
math.FA math.AG