IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
iter via intseg split mid12 1. A : Type
2. f : AAA 3. u : A 4. is_ident(A; f; u)
5. is_assoc_sep(A; f)
6. a : 7. c : 8. a = c b:, e:({a..b}A).
ac cb (Iter(f;u) i:{a..b}. e(i))
=
f((Iter(f;u) i:{a..c}. e(i)),Iter(f;u) i:{c..b}. e(i))