IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
iter via intseg all units1 1. A : Type
2. f : AAA 3. u : A 4. is_ident(A; f; u)
a,b:, e:({a..b}A).
(i:{a..b}. e(i) = u) (Iter(f;u) i:{a..b}. e(i)) = u