Nuprl - Proof: bij imp exists inv version2 1 2 1 1 1

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At: bij imp exists inv version2 1 2 1 1 1

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

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

b:B.

!a:A. f(a) = b
7. g : B

A
8.

b:B. f(g(b)) = b
9. x : A

f(g(f(x))) = f(x)

By:	BackThru: Hyp:8

Generated subgoals:

None

About:

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