Nuprl - Proof: ooc preserves dededkind inf 1 1 2 1 1

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At: ooc preserves dededkind inf 1 1 2 1 1

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

B
4. g : B

A
5. InvFuns(A;B;f;g)
6. a : A
7. h : A

A
8. Inj(A; A; h)
9. x : B
10. f(h(g(x))) = f(a)

x:A. h(x) = a

By:	ApFun: g to: Hyp:-1

Generated subgoal:

1 11. g(f(h(g(x)))) = g(f(a))
x:A. h(x) = a
3 steps

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