Nuprl - Proof: inv pair iff ooc 1 1

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At: inv pair iff ooc 1 1

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

{fg:((A

A))| fg/f,g. InvFuns(A;B;f;g) }

f:(A

B), g:(B

A). InvFuns(A;B;f;g)

By:	2 Times Analyze3 THEN New:[f \| g] Analyze-2 THEN Reduce Hyp:-1

Generated subgoal:

1 3. f : AB
4. g : BA
5. InvFuns(A;B;f;g) [not for witness]
f:(AB), g:(BA). InvFuns(A;B;f;g)
1 step

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