Nuprl - Proof: inv pair inv 1 3 1 2 1 1 1 1 1 1 1 2

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At: inv pair inv 1 3 1 2 1 1 1 1 1 1 1 2

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

fg.fg/f,g. <f,g,(

x.*),(

y.*)>)

(A ~ B)
4. (

fga.fga/f,#. #/g,a. <f,g>)

(A ~ B)

B
5. f : A

B
6. g : B

A
7.

x:A. g(f(x)) = x
8.

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

g(f(x)) = x

By:	BackThruHyps

Generated subgoals:

None

About:

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