1. A : Type
2. f : AAA 3. u : A 4. is_ident(A; f; u)
5. is_assoc_sep(A; f)
6. a : 7. b : 8. c : {a...b}
9. d : {c..b}
10. e : {a..b}A 11. i:{a..b}. i<cdie(i) = u (Iter(f;u) i:{a..b}. e(i)) = (Iter(f;u) i:{c..d}. e(i))
4 steps
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