Nuprl - Proof: fun with inv is bij version2 1 1

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At: fun with inv is bij version2 1 1

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

B
4. g : B

A
5.

x:A. g(f(x)) = x
6.

y:B. f(g(y)) = y

Bij(A; B; f)

By:

Analyze

Generated subgoals:

1 Inj(A; B; f)
3 steps

2 Surj(A; B; f)
3 steps

About:

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