Nuprl - Proof: left inv of surj is right inv 1 1 1

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At: left inv of surj is right inv 1 1 1

1. A : Type
2. B : Type
3. f : A

B
4. g : B

A
5. Surj(A; B; f)
6.

x:A. g(f(x)) = x
7. y : B
8. a : A
9. f(a) = y

f(g(f(a))) = f(a)

By:	Rewrite by Hyp:6

Generated subgoals:

None

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IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html