Two models of synthetic domain theory encompassing traditional categor
ies of domains are introduced. First, we present a Grothendieck topos
embedding the category omega-Cpo of omega-complete posets and omega-co
ntinuous functions as a reflective exponential ideal. Second, we obtai
n analogous results with respect to a category of domains and stable f
unctions. (C) 1997 Elsevier Science B.V.