Nuprl - Proof: inv funs 2 sym 1

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At: inv funs 2 sym 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
7. x : B

f(g(x)) = x

By:	BackThru: Hyp:6

Generated subgoals:

None

About:

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