Assuming arbitrary Environments 5,】)-=(,X7)y,x")m < d)==(T,d)(T"’o") a Too strong to be satisfied, since env. can be arbitrarily bad Refinement applications have assumptions about s eny(T’ , ’’) (T’’, ’’’) … (S’, ’’) * (S’’, ’’’) … ’ ’ e e Assuming Arbitrary Environments env env  Too strong to be satisfied, since env. can be arbitrarily bad. (T, ) (T’ , ’) (S, ) (S’, ’) * ’ ’ Refinement applications have assumptions about S & env