Nuprl - Proof: ooc preserves dededkind inf 1 1 2

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At: ooc preserves dededkind inf 1 1 2

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:A. h(x) = a)

(

x:B. (f o h o g)(x) = f(a))

By:	Reduce Concl THEN SimilarTo Hyp:-1

Generated subgoal:

1 9. x:B. f(h(g(x))) = f(a)
x:A. h(x) = a
5 steps

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