Nuprl - Proof: bij imp exists inv version2 1 2

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At: bij imp exists inv version2 1 2

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

g:(B

A). InvFuns(A;B;f;g)

By:	Witness: g

Generated subgoal:

1 InvFuns(A;B;f;g)
3 steps

About:

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