Nuprl - Proof: compose iter surjection 1 2 1 1

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At: compose iter surjection 1 2 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

a:A. f{

i}(a) = b

By:	Inst: Surj(A; A; f) Using:[a] THEN New:u Analyze-1

Generated subgoal:

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

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