Nuprl - Proof: inv funs 2 unique 1 1

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At: inv funs 2 unique 1 1

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

B
4. g : B

A
5. h : B

A
6.

x:A. g(f(x)) = x
7.

y:B. f(g(y)) = y
8.

x:A. h(f(x)) = x
9.

y:B. f(h(y)) = y
10. y : B
11. g(f(g(y))) = g(f(h(y)))

g(y) = h(y)

By:	Rewrite-1 by x:A. g(f(x)) = x

Generated subgoals:

None

About:

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