Abstract
In this paper we are mainly concerned with DW rings, i.e., rings
in which every ideal is a w-ideal. We give some new classes of DW rings and we
show how the concept of DW domains is used to characterize Prufer domains
and Dedekind domains. Namely, we prove that a ring is a Prufer domain
(resp., Dedekind domain) if and only if it a coherent (resp., Noetherian) DW
domain with nite weak global dimension.