An intrinsic definition of the Rees algebra of a module
  This paper concerns a generalization of the Rees algebra of ideals due to Eisenbud, Huneke and Ulrich that works for any finitely generated module over a noetherian ring. Their definition is in terms of maps to free modules. We give an intrinsic definition using divided powers. 
Gustav S{\ae}d\'en St{\aa}hl
math.AC math.AG