Nuprl - Proof: compose iter surjection 1 2 1 1 1 1 1

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At: compose iter surjection 1 2 1 1 1 1 1

1. A : Type
2. f : A

A
3. Surj(A; A; f)
4. i :

5. 0<i
6. b : A
7. a : A
8. f{

i-1}(a) = b
9. u : A
10. f(u) = a
11. f{

i-1}(f(u)) = b

i}(u) = f{

i-1}(f(u))

By:	Rewrite by f(u) = f{1}(u) A THENA Rewrite by Thm* f:(AA). f{1} = f

Generated subgoal:

1 f{i}(u) = f{i-1}(f{1}(u))
1 step

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